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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) | 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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Glitch items are invalid items in the Pokémon games. Unavailable items such as Pokémon FireRed and LeafGreen key items in Pokémon Emerald may also be considered to be glitch items, as well as unused/unavailable items such as ????? (hex:07) and BoulderBadge (hex:15) — see unused items.

Glitch items may have special uses (in Generations I and II), different names (in Generation I and to an extent Generation II) and Poké Mart buy and sell price data.

Some glitch items such as "9F" (hex:5E) in Pokémon Red and Blue or Pokémon Yellow, or "RIVAL'S" (hex: A2) in Red and Blue, or "o" (hex:94) in Yellow always have the same use(s).

Other glitch items execute data in writable memory, with a select few glitch items such as such as "8F" in Pokémon Red and Blue (hex:5D) and "ws m" in Pokémon Yellow (hex:63) being ideal for arbitrary code execution.

In Pokémon Red, Green, Blue, and Yellow

Glitch items occupy index numbers hex:00, hex:54 through to hex:C3 and hex:FB through to hex:FF.

Many glitch items are available with the Celadon looping map trick, Item creation glitch (a Select glitch in Red/Green/Blue), Yami Shop glitch and other Poké Mart vendor glitches.

Examples of particularly useful glitch items include:

Name Index number (hexadecimal) Index number (decimal) Game Uses
j. 00 0 Pokémon Red and Blue One of the most common glitch items, which can be sold for a high price of 414925 Pokédollars.
#×## 00 0 Pokémon Yellow One of the most common glitch items, which can be sold for a high price of 414925 Pokédollars.
CascadeBadge 16 22 Pokémon Red, Blue, Yellow Throw a rock and double a wild Pokémon's catch rate.
8F 5D 93 Pokémon Red and Blue Arbitrary code execution (initially runs D163; Pokémon data)
9F 5E 94 Pokémon Yellow Reload a map and bring graphics back to normal after a Super Glitch induced Glitch City.
9F 5E 94 Pokémon Red and Blue Restart a Trainer battle. Partially escape from a wild battle (useful for LOL glitch). Overflowing the stack.
かいがらバッヂ (Shell Badge) 63 99 Pokémon Yellow (Japanese) Arbitrary code execution (initially runs D9B2; stored Pokémon data).
ws m 63 99 Pokémon Yellow Arbitrary code execution (initially runs DA7F; stored Pokémon data).
なかよしバッヂ (FriendBadge) 67 103 Pokémon Red, Green, and Pokémon Blue (Japanese) Arbitrary code execution (initially runs D983, number of Safari Balls and the Day Care data, stored Pokémon data which follows. A special Day Care Pokémon name can be used to redirect the code directly to a location of the player's choice, otherwise if there is no Safari Ball/Day Care data, stored Pokémon data can be used like English Yellow's ws m and English Red/Blue's -g m.
-gm 6A 106 Pokémon Yellow Restart a Trainer battle. Partially escape from a wild battle (useful for LOL glitch)
-g m 6A 106 Pokémon Red and Blue Arbitrary code execution (initially runs DA47; in which Safari Zone data and Day Care data follows. If this is blank; code will 'fall through' to DA80; stored Pokémon data).
Lg- 6E 110 Pokémon Yellow Restart a Trainer battle. Partially escape from a wild battle (useful for LOL glitch). Make walking Pikachu stay (useful for Pikachu off-screen glitch).
 ????? 7 7 Pokémon Red, Blue, Yellow Acts outside of battle like using the field move Surf. Can also be used to change to the wrong music bank inside of a battle if used in a battle facing water.
(blank) 78 120 Pokémon Red and Blue Restart the music. Change to an overworld (02, 1F) sound bank from the sound bank (08). Play the music with ID at D35B with bank at D35C (D35B, D35C can be manipulated with expanded items pack).
てへ 7B 123 Pokémon Red and Green Arbitrary code execution (initially runs D806; wild Pokémon data or temporary player name storage for the old man battle). Unterminated name glitch item in Red/Green v1.1
え゙円にグぅ4えやけぼ 7B 123 Pokémon Blue (Japanese) Unterminated name glitch item in Red/Green v1.1. Arbitrary code execution (initially runs D806; wild Pokémon data or temporary player name storage for the old man battle).
8 8 7C 124 Pokémon Red and Blue Create encounter chains from a Trainer escape glitch encounter by using it when the menu pops up in a specific map. Must be used indirectly via unterminated name glitch item, or in combination with a unterminated name glitch item, to avoid a freeze when CFC4 is odd.
PC 80 128 Pokémon Red and Blue Unterminated name lagless glitch item (useful for LOL glitch). Hex:00 item effect freeze.
2pゥ 92 146 Pokémon Yellow Unterminated name lagless glitch item (useful for LOL glitch). Acts as an Ultra Ball.
o 94 148 Pokémon Yellow Activate the Rival's effect. Otherwise if used on a Pokémon may act like an Awakening.
RIVAL'S A2 164 Pokémon Red and Blue Activate the Rival's effect. Otherwise if used on a Pokémon may acts like an item with no noticeable effect.

In Pokémon Gold, Silver and Pokémon Crystal

Glitch items in Pokémon Gold, Silver and Pokémon Crystal occupy a number of index numbers, as such:

Hex ID Dec ID Item
00 0 ?
06, 19, 2D, 32, 38, 46 (G/S only), 5A, 64, 73 (G/S only), 74 (G/S only), 78, 81 (G/S only), 87, 88, 89, 8D, 8E, 91, 93, 94, 95, 99, 9A, 9B, A2, AB, B0, B3, BE 5, 19, 45, 32, 38, 46 (G/S only), 90, 100, 115 (G/S only), 116 (G/S only), 120 (G/S only), 129 (G/S only), 135, 136, 137, 141, 142, 145, 147, 148, 149, 153, 154, 155, 162, 171, 176, 179, 190 Teru-Sama
C3 195 TM04 (useless)
DC 220 TM28 (useless)
FA 250 HM08 (disambiguation)
FB 251 HM09 (disambiguation)
FC 252 HM10 (disambiguation)
FD 253 HM11 (disambiguation)
FE 254 HM12 (disambiguation)
FF 255 HM13/CANCEL/Berry

Note that Teru-Sama items which are not Teru-Sama in Crystal are the key items "Clear Bell" (hex:46), "GS Ball" (hex:73), "Blue Card" (hex:74) and "Egg Ticket" (hex:81) respectively.

TMs and HMs outside of the correct pocket

In addition to the regular glitch items in Gold, Silver, Crystal, all of the normal TMs and HMs will serve as glitch items when used outside of the TM/HM pack, due to having invalid execution pointers.

Below are a number of useful TMs and HMs to use outside of the relevant pocket.

(Sources: [1], [2], [3])

Hex ID Dec ID Item Version Use
CE 206 TM15 Crystal (Japanese) Executes arbitrary code from FA10 (Echo RAM for DA10, which is somewhere in the expanded Balls pocket. If "(item) x195", "Star Piece x 252" (represents C3 84 FB - a jump to FB84, box 4 name character 2) are stored at DA0F, then this will serve as a bootstrap code to stored box Pokémon names.
CE 206 TM15 Crystal (English) Executes arbitrary code from FA10 (Echo RAM for DA10, which is somewhere in the expanded Balls pocket.
D0 208 TM17 Crystal (English) Executes arbitrary code from FA47 (Echo RAM for DA47, which is somewhere in the expanded Balls pocket.
D4 212 TM21 Crystal (English) Executes arbitrary code from FA69 (Echo RAM for DA69, which is somewhere in the expanded Balls pocket; like TM21.
D8 216 TM25 Crystal (English) Executes arbitrary code from FA69 (Echo RAM for DA69, which is somewhere in the expanded Balls pocket; like TM25.
D8 216 TM25 Gold/Silver (English) Executes arbitrary code from FA6A (Echo RAM for DA6A, and DA6A is the least significant Defense EV byte of the second Pokémon in the party. The Speed EVs word follows, and the player can make a jump to somewhere more useful (via C3 yy xx). This may be possible without trading, but getting the exact EVs would be tedious and it would be hard to keep track of them without a memory viewer. Through arbitrary code execution in Pokémon Red, Blue, Yellow, the second Pokémon may be manipulated to have Defense and Speed EV values that the player desires.
E1 225 TM33 Crystal (English) Executes arbitrary code from F418 in Echo RAM (essentially D418); the third character of the fifth enemy Pokémon's nickname. Through arbitrary code execution in Pokémon Red, Blue, Yellow, the player may rename this Pokémon to include a jump instruction (e.g. to C3 F2 D8 bytes which reads jp D8F2, i.e. jumps to the first item in the item storage system).
EF 239 TM47 Gold/Silver (English) Allows the player to offset their position on the map, as documented here.

In Pokémon Ruby, Sapphire and Pokémon Emerald, Pokémon FireRed and LeafGreen

There are many glitch items in these games named "????????" with no apparent use other than for arbitrary code execution setup. The hex:FFFF "????????" can be distinguished for having the 'return to menu' sprite as its sprite.

These items are available through a double corruption with the Pomeg corruption glitch to force a Pokémon holding one. It is also possible to obtain a ???????? with the Mail and Trick glitches in Japanese Pokémon Ruby and Sapphire.

One way of obtaining them with the Pomeg corruption glitch is through corrupting the in-game trade Pokémon DOTS the Seedot with Defense and Speed EVs spelling out the index number of the desired items with at least 1 HP EV (so it isn't corrupted into an empty space).

In Pokémon Diamond, Pearl and Platinum, Pokémon HeartGold and SoulSilver

These games feature a hex:0000 glitch item which is referred to as "None" when forced as a Poké Mart gift. There are also glitch items with index numbers between hex:0071 and hex:0086, and a large number of other glitch items which may be nameless.

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