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Coin Case glitches
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Major glitches of the Pokémon series

Arbitrary code execution (template, remote, cart-swap, unintended ROM code execution) | 2x2 block encounter glitches (Left-facing shore tile glitch (in-game trade shore encounter trick, old man trick, Trade link up shore encounter trick, Fight Safari Zone Pokémon trick)) | 99 item stack glitch | Bad clone glitch (????? party overloading (Type 0xD0 move glitch, ????? map corruption, | Celebi trick, Celebi Egg trick, Shiny Celebi trick, glitch move map corruption, overloaded party map corruption, Glitch Unown (Glitch Unown map corruption) Duplicate key items glitch (infinite items and item creation, expanded Balls pocket (TM/HMs outside of the TM/HM pocket, Glitch Pokédex categories)) | Berry glitch | Bug-Catching Contest data copy glitch (Japan only) | Cloning | Ditto DV manipulation | Elite Four door glitch (Japan only) | Expanded party encounter table manipulation | Generation IV item cloning glitch (Japan only) | Glitch City (Safari Zone exit glitch, RAM manipulation) | Glitch meta-map script activation (Generation I) | Infinite Master Balls (Colosseum) | Large storage box byte shift glitch (storage box remaining HP glitch, maximum stat glitch) | Item duplication glitch | Item stack duplication glitch (Generation I expanded items pack (Glitch Rocket HQ maps, Map FE (English and non-English European Yellow), Map script pointer manipulation (arbitrary code execution, map script pointer item ball manipulation), Text pointer manipulation (arbitrary code execution, item ball manipulation, mart buffer overflow), Trainerless instant encounter glitch) | Mimic glitch (Japan only) | Out of bounds Glitch City (Generation II) (Slowpoke Well out of bounds corruption (French version)) Lumiose City save glitch | Pikachu off-screen glitch (Trainer corruption glitch) | Pokémon merge glitch | Pomeg glitch (Pomeg data corruption glitch) | Roaming Pokémon encounter glitch | (Mimic) Transform Rage glitch | Select glitches (Japan only) (Closed menu: Dokokashira door glitch (international), Fossil conversion glitch (international), Second type glitch, Skip to Level 100 glitch, Trainer mutation glitch, walk through walls (international) Special menu: Lift glitch, Badge describer glitch) | Sketch glitch | SRAM glitch (Generation I) (255 Pokémon glitch, send party Pokémon to a new game) | Surf down glitch (Grass/rock Surfing glitch (Spanish/Italian only) (English)) | Time Capsule exploit | SRAM glitches (Generation II) (Mailbox glitches, Mystery Gift item corruption, Trainer House glitches) | Tweaking | Trainer escape glitch (Death-warp, Mew Trick, Ditto Trick, Experience underflow glitch) | Buffer overflow techniques (Japanese unterminated name glitch item instant encounter glitch, LOL glitch, Rival LOL glitch, Instant LOL glitch, RAM LOL glitch, oobLG, blockoobLG, Instant encounter infinite chain glitch (LGFly)), Super Glitch (Generation I) (party remaining HP glitch), Super Glitch (Generation III), Text pointer manipulation mart buffer overflow glitch, CoolTrainer♀-type move, Double distort CoolTrainer♀ corruption, Yami Shop glitch) | Walk through walls (ledge method, museum guy method, Rival's effect, Select glitch method (international), Brock Through Walls) | ZZAZZ glitch (party Pokémon box data shift glitch)

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A glitch dimension caused by listening to Machop or Bellsprout's cry then viewing the Coin Case.

The Coin Case glitches are glitches that are exclusive to the English versions of Pokémon Gold and Silver. These glitches do not exist in any other localization of the game, such as the Japanese version, and it do not exist in Pokémon Crystal.

Coin Case glitches were previously thought to be relatively useless, with things like Glitch Dimensions, 'glitchy coin counts' and freezes, being the only effects found, however, after Sanky and TheZZAZZGlitch researched the glitch, it was found that is possible to execute execute arbitrary code with it to do many things which began with exploits such as causing a custom message to be displayed by the Coin Case, warping to Mt. Silver and enabling Red, and obtaining Celebi or a ????? (FF).

Arbitrary code execution exploits summary

There are two commonly used variations of Coin Case arbitrary code execution. These include both arbitrary code execution through using box names and through using stored PC items.

Having a 'fresh' low level Pokémon (also known as a "slide Pokémon") in slot 3 and a special Quagsire in slot 4, making a specific movement pattern (such as four steps right from walking out of Cherrygrove Poké Mart or Professor Elm's lab), listening to Bellsprout or Machop's cry, switching item pockets (necessary) and using the Coin Case will lead to arbitrary code execution.

In order to execute box names as code (beginning from the second character of the first box name) the Quagsire should be holding a TM02 with Return as its first move.

If the player wants to start the execution at the first character of the first box name the Quagsire should be holding a TM01 instead, however TM02 can be obtained multiple times while TM01 cannot and this will likely not be compatible with codes that expect the TM02 setup.

In order to execute stored PC items as code the Quagsire should instead be holding a HP Up and know Sleep Talk as the first move (if the code starts at stored item 2's quantity), or be holding a Protein with Sleep Talk as the first move (if the code starts at stored item 3's item).

Troubleshooting

Emulation problems

Coin Case arbitrary code execution sadly will only work on English (both NA, EU, likely AUS) versions of Pokémon Gold and Silver. It will not work in the French, German, Spanish, Italian versions nor the Japanese and Korean versions.

If Coin Case arbitrary code execution is being performed on an emulator, it should first be performed on one that supports Echo RAM, as the Coin Case will always execute code in this region, and if there is incorrect emulation any Coin Case arbitrary code execution glitches will not work. An example of an emulator that doesn't support Echo RAM emulation is an older version of VisualBoyAdvance (however some newer versions support it), while an example of an emulator that correctly supports Echo RAM emulation is the latest version of BGB emulator.

Furthermore Coin Case arbitrary code execution may not work on Pokémon Stadium 2's GB Tower again due to incorrect Echo RAM emulation.

A few glitches that rely on obscure hardware details, such as YouTube user Crystal_'s real time walk through walls glitch OAM DMA exploit may also fail to work on certain platforms/emulators (possibly even including the 3DS Virtual Console Pokémon Gold and Silver).

Slide Pokémon

One of the most common problems with Coin Case arbitrary code execution is from having a bad slide Pokémon in slot 3. A "slide Pokémon" is a Pokémon that hasn't been trained, has good DVs, is at a good level (preferably low, caught from Route 29), has good stats and a non-problematic happiness value.

Unfortunately getting a good slide Pokémon is luck dependent, and it could take many attempts (even over 20 Pokémon) for you to get one.

The reason why bad attributes on the slide Pokémon is problematic is because these attributes are executed as code, until the game gets to Pokémon 4 where it reads the Quagsire's held item and first move as a jump location (because Quagsire's index number C3 represents the instruction jp yyxx) to a place like box names or stored PC items (depending on the item and move). This means bad opcodes such as FF (rst $38) could cause the game to not 'fall through' to the Quagsire's data, causing the game to never be able to execute the box names or stored PC items as code.

If a slide Pokémon was working in the past and suddenly stopped working the problem could be caused if the Pokémon gained experience (increasing its stat experience) or gained a bad happiness value. For this reason one should not walk too many steps with the slide Pokémon, and it is a good idea to faint the slide Pokémon if it previously worked but you can't get it to work anymore and didn't make it gain any experience.

Wrong box names/stored PC items

It is very important for the box names (if using a box name method) to be exactly right. If they are wrong (even if it is a small mistake such as using a character without an apostrophe before it or the wrong "x" character) the glitch will most likely not work. For this reason be extra careful when entering the box names.

It is also important to have stored PC items that are exactly right and are in the exact order if using a stored PC item method.

Sometimes as well a box name or stored PC item code will expect that the code begins at a specific location (such as character 2 of the first box name if using TM02 and Return). If the code is meant to be for another setup (like character 1 of the first box name if using TM01 and Return) then the code may not work.


Not switching pockets

Before using the Coin Case it is very important to switch item pockets at least once, or the glitch may not work.

Cries and movement pattern

If the player listened to a Pokémon cry other than Bellsprout, Machop (and a select few other compatible Pokémon) the glitch won't end up executing code in the desired location.

The player must also make the exact number of steps for the movement method (most commonly four steps right after walking outside of Professor Elm's lab or Cherrygrove City's Poké Mart) as making the wrong movement pattern will cause the arbitrary code execution glitch not to work.

Pressing A after viewing the Coin Case

For some box name codes, pressing A instead of B after viewing the number of coins in the Coin Case may cause the game to reset or freeze. For this reason one should always press B.

Immediately using the Coin Case again for the box name method can also cause the game to freeze, so one should never use the code again until they save and reset the game.

These codes may also slow down menus to the extreme and disable sprites. This is a workaround to the Coin Case glitch corrupting the stack pointer and can be fixed by tapping down to get to the save option, tapping A to save the game and resetting the game. Changing "Menu Account" to off in the settings beforehand will also disable the lag caused by the glitch.

Cause

In the Japanese versions of Pokémon Gold and Silver, after the hiragana 'まい' in the dialog "あなたの コイン (n)まい" (your number of coins) appears, a hex:57 control character is used (at offset 0xF9FE, in both versions, and in both revisions v1.0 and v1.1), and it is valid as a terminator in these versions.

The hex:57 character is still used as a terminator for "Coins: (x)" in the English versions (at offset 01985B0), but it is no longer a valid terminator there. The game jumps into memory at echo RAM address E112, which is essentially C112 and executes arbitrary code from there. This section of the memory can be changed by listening to cries, but if the player didn't listen to any cry, it is mainly 00, so 'nothing happens'.

When the player listens to a certain Pokémon cry before using the Coin Case, the game will execute code that has a noticeable effect, including glitch dimensions, altered number of coins text and freezes, due to the data no longer being mainly 00.

Machop, Bellsprout and other Pokémon's cries are special because they put a hex:33 at ECHO:E117. This is read as the opcode 'inc sp' (increment stack pointer) causing the next 'ret' (return) to go elsewhere, specially to EB12, which contains overworld data. Even though there is no known way to predict the contents of this data, the results are consistent if you move in a specific pattern.

By having useful overworld data here, which can be manipulated by moving around, it is possible for the game to jump to an address that can reasonably be manipulated (i.e. to make the game jump to at least[clarification needed] ECHO:FA98 (essentially DA98), which is the second byte of the third Pokémon's attack stat experience).

This glitch was patched in language versions later than the English version and never occurred in the original Japanese versions; Kin/Gin. Foreign versions other than the Japanese versions use the valid hex:50 terminator instead of a hex:57 'terminator' in at least the French, German, Italian and Spanish versions. While Pocket Monsters Kin/Gin use a hex:57 character, it is a valid terminator here.

It does not exist in English Pokémon Crystal, which also uses the correct 50 terminator (at offset 1C5C88).

(Thanks to Sanky from the forums for the explanation, Wack0 for pointing out the changes to 50 in foreign non-Japanese versions and Torchickens for noticing there is a 57 as a terminator in the Japanese version)

Get Celebi with Coin Case arbitrary code execution

YouTube video by TheZZAZZGlitch

This trick allows you to change the recipient byte of a Pokémon in Day-Care south of Goldenrod City to hex:FB, the same as Celebi. It was made by TheZZAZZGlitch.

Since withdrawing a Pokémon from Day-Care makes the game match the donor byte to the value in the recipient byte, it will be a perfectly stable Celebi when it is withdrawn.

Requirements

This glitch requires specific items in the player's item storage system (see below), and they need to be in the exact order they appear in the table, from top to bottom. For this trick, when it is done correctly, the last jump the game makes will be to the address which governs the item storage system's quantity of the second item (D61A).

Item Quantity
[ANY ITEM] [ANY QUANTITY]
[ANY ITEM] x38
TM27 x2
Fresh Water x42
Lovely Mail x1
HM07 x1
Poke Ball x65
Great Ball x4
Everstone x1
[ANY ITEM] [ANY QUANTITY]
Surf Mail x51
Full Heal x18
Flower Mail x46
HM03 x1
X Speed x1
TM06 x1
[ANY ITEM] [ANY QUANTITY]
TM41 x1

When the items above exist in the PC, the player will also need in the party:

  • A freshly caught low level Pokémon.
  • A Quagsire holding a HP UP, with Sleep Talk as the first move.
  • Any Pokémon (this will become Celebi).

The player also needs:

  • The Coin Case
  • A Pokémon including Bellsprout, Machop, Machoke or Omanyte registered in the Pokédex.
  • Access to the Pokémon Day-Care on Route 34 and New Bark Town via Fly.

Steps

First confirm that you meet the requirements above.

  1. Put the low level Pokémon in your third slot. Put your Quagsire in your 4th slot. Put the chosen Pokémon (which will become Celebi) in your first slot.
  2. Fly to New Bark Town and enter Prof. Elm's lab. Save and reset.
  3. Step out of Prof. Elm's lab, take four steps right (so you are below the tree), then open the Pokédex and listen to either Bellsprout, Machop, Machoke or Omanyte's cry.
  4. Exit the Pokédex, and open the items pack and switch over to the Key Items pocket. Switching pockets before viewing the Coin Case after listening to the cry in the current session is important, otherwise the trick won't work properly.
  5. Use the Coin Case. If you followed the steps properly the game won't cause a glitch dimension or freeze.
  6. Fly over to Goldenrod City and walk south to the Pokémon Day-Care Center. Enter it.
  7. Deposit the chosen Pokémon (do not deposit another Pokémon) with the Day-Care man or lady and get it back to get Celebi. Its name will not be changed (e.g. it may be still called 'Rattata'), so you will have to rename it at the Name Rater in Goldenrod City north of the Magnet Train station. It will also have its old moves, but you can remove illegal moves at the Move Deleter in Blackthorn City at the house west of the Poké Mart.

Get ????? (FF) with arbitrary code execution

To get ????? (FF), you can do the exact same Celebi trick described above, but with two extra stacks of Great Ball x4 below the first one (item 8). This is because Great Ball x4 corresponds to two of the opcodes 'inc b' (as one address is for the item identifier, and another is for the quantity), and the opcode 'inc b' increases the register 'b' by one. Normally the result here is FB; Celebi's index number, but having two extra Great Ball x4 adds four inc b, and FB + 4 = FF, which is ????? (FF)'s index number.

"Hello world" program

This article needs fact checking to ensure accuracy
YGlitch255 f.png
Please verify the claims in the article. Also consider that something may be specific to a certain revision of the game and beware of generalizations.


YouTube video by TheZZAZZGlitch

This trick was made by TheZZAZZGlitch and lets the player change the 'number of coins' to a Pokémon's nickname.

Requirements

Like the Celebi trick described above, this trick requires certain items in the PC, and the order matters. They are listed below.

Item Quantity
[ANY ITEM] [ANY QUANTITY]
[ANY ITEM] x38
TM27 x2
Nugget x1
[ANY ITEM] [ANY QUANTITY]
Surf Mail x46
Charcoal x1
[ANY ITEM] [ANY QUANTITY]
Squirtbottle x1
[ANY ITEM] [ANY QUANTITY]
Leaf Stone x1
[ANY ITEM] [ANY QUANTITY]
Ice Heal x62
Revive x7
Lovely Mail x60
Ultra Ball x34
Flower Mail x51
Max Repel x43
TM37 x1
[ANY ITEM] [ANY QUANTITY]
Full Heal x18
Portraitmail x46
HM03 x1
[ANY ITEM] [ANY QUANTITY]
TM41 x1

Like the species changing trick described above, a freshly caught low level Pokémon is needed, as well as a Quagsire holding a HP UP with Sleep Talk as its first move. Other requirements include the stored items above, the Coin Case, access to the Name Rater in Goldenrod City and the ability to use Fly to Goldenrod City and New Bark Town.

Steps

  1. Put the low level Pokémon in the third slot.
  2. Put the Quagsire in the fourth slot.
  3. Go to the Name Rater north of the Magnet Train station and change the first Pokémon's nickname to something that is 10 characters ('AAAAAAAAAA' is used in the video).
  4. Afterwards, change the nickname of the first Pokémon to something nine characters long, which will be what you want the Coin Case to display.
  5. Fly to New Bark Town and enter Prof. Elm's laboratory, save the game and reset.
  6. Exit the lab, take four steps right (so you're below the tree), then open the Pokédex and listen to Machoke's cry (other cries like Bellsprout may work, but they are unconfirmed).
  7. Switch to the Key Items pocket (it is important that you do the switch after listening to the cry and before using the Coin Case), then use the Coin Case.
  8. The first Pokémon's nickname will be displayed under 'Coins:' instead of the current amount of coins.

Known 'random' but consistent effects

This section lists effects that happen randomly, but may happen consistently after a player listens to a Pokémon's cry.

A Pokémon listed under any of these effect headers does not mean it will always cause the effect, but simply that it may without further manipulation.

The effects here happen for:

Saving the game and resetting next to the Machop in Vermilion City, and not moving before or after listening to the Pokémon's cry. But they commonly happen in other circumstances.

Glitch Dimension

Main article: Glitch Dimension

This was one of the first known applications of the glitch, and the described requirements were talking to the Machop flattening out the land in Vermillion City and then using the Coin Case.

However, the player does not need to talk to that particular Machop; the cry of any Machop may cause the same effect (not when following one of the arbitrary code execution steps described in earlier sections).

The cries of the following Pokémon in the Pokédex can be used to start a Glitch Dimension.

  1. Bulbasaur[citation needed]
  2. Caterpie[citation needed]
  3. Metapod[citation needed]
  4. Weedle[citation needed]
  5. Kakuna[citation needed]
  6. Beedrill[citation needed]
  7. Pidgey[citation needed]
  8. Arbok[citation needed]
  9. Pikachu[citation needed]
  10. Raichu[citation needed]
  11. Nidoran♀[citation needed]
  12. Nidorina (without switching item pockets)
  13. Nidorino[citation needed]
  14. Clefairy (may require not having switched items pockets)
  15. Clefable (may require not having switched items pockets)
  16. Vulpix[citation needed]
  17. Ninetales[citation needed]
  18. Jigglypuff[citation needed]
  19. Wigglytuff[citation needed]
  20. Zubat[citation needed]
  21. Oddish[citation needed]
  22. Paras[citation needed]
  23. Diglett[citation needed]
  24. Dugtrio[citation needed]
  25. Psyduck[citation needed]
  26. Mankey[citation needed]
  27. Poliwhirl[citation needed]
  28. Abra[citation needed]
  29. Machop
  30. Machoke
  31. Machamp[citation needed]
  32. Bellsprout (works like Machop)
  33. Tentacool[citation needed]
  34. Geodude[citation needed]
  35. Magnemite[citation needed]
  36. Farfetch'd (after switching item pockets)
  37. Doduo[citation needed]
  38. Seel[citation needed]
  39. Drowzee[citation needed]
  40. Krabby[citation needed]
  41. Voltorb[citation needed]
  42. Hitmonlee[citation needed]
  43. Horsea
  44. Meganium (without switching item pockets)
  45. Cyndaquil[citation needed]
  46. Totodile[citation needed]
  47. Croconaw[citation needed]
  48. Natu[citation needed]
  49. Xatu[citation needed]
  50. Mareep[citation needed]
  51. Flaaffy[citation needed]
  52. Miltank[citation needed]
  53. Celebi

"Which move?he PP of." (Dratini glitch)

This effect is also known as the "Dratini glitch". It will cause the text "Coins:Which move?PP of." to pop up after viewing a certain cry and using the Coin Case. This text is long enough to go outside of the text box border.

The following cries have been confirmed to work:

  1. Charmander
  2. Charmeleon
  3. Squirtle
  4. Wartortle
  5. Butterfree
  6. Ekans
  7. Sandshrew
  8. Gloom
  9. Dratini
  10. Articuno
  11. Moltres
  12. Larvitar

"Which move?"

This effect will cause the text 'Coins:Which move?PP of.' to pop up after viewing a certain cry, not switching item pockets, and using the Coin Case.

The cries of the following Pokémon have been confirmed to work.

  1. Venusaur
  2. Dragonair
  3. Ho-oh
  4. Lugia
  5. Tyranitar
  6. Pupitar

Other effects

Other Coin Case glitch effects include game freezes and 'random' tiles being placed on the screen. The effects may depend on whether the player switched item pockets before viewing the Coin Case.

Here is a list of Pokémon that can cause effects other than a Glitch Dimension or the effects 'which move?he PP of.' or 'Which move?':

  1. Clefairy[citation needed]
  2. Clefable[citation needed]
  3. Paras (switching pockets before viewing the Coin Case may cause a different effect, including a tile being placed on the screen)
  4. Dodrio (may require not switching item pockets)
  5. Nidorina (after switching item pockets it may place a tile on the screen)
  6. Farfetch'd (without switching item pockets, it may freeze the game)
  7. Meganium (after switching item pockets the game may print a glitch character after the number of coins)

See also

  1. Arbitrary code execution.
  2. Glitch Dimension - One of the effects which can be caused by a Coin Case glitch.
  3. Game freeze.

External Links