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International fossil conversion glitch
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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 fossil Mew from the English fossil conversion glitch.

The international fossil conversion glitch is an adaption of the fossil conversion glitch for international Pokémon Red, Blue, Yellow.

It allows the player to obtain many glitch Pokémon including glitch Pokémon unavailable with the Trainer escape glitch and Time Capsule exploit.

Summary

The fossil conversion glitch has you depositing a fossil and then changing what it is afterwards. In the Japanese versions, the trick involves a Pokémon's total experience modulo 256 determining the species. With the English adaption, it's the Pokémon's Attack stat modulo 256 that determines the species.

For this trick you need access to over 6 Pokémon. After you get over 6 Pokémon and deposit a fossil, you need to swap any Pokémon with the 33rd (note, in the Japanese trick it is the 32nd; and the 32nd Pokémon was accessed with the 32nd PC item).

The only known ways possible to get over 6 Pokémon in the English version are the 255 Pokémon glitch, Super Glitch and arbitrary code execution.

Unfortunately one of the things Super Glitch does is corrupt your name, and if a 50 is not present on the eleventh character, saving will destroy the save. But there is a work around, documented by TheZZAZZGlitch.

Method (Red/Blue 255 Pokémon glitch)

It is possible to set up the international Fossil conversion glitch with the 255 Pokémon glitch subglitch of the SRAM glitch.

For more information, see this forums thread.

http://forums.glitchcity.info/index.php?topic=7137.msg198722#msg198722

YouTube video by Krys3000

Method (Red/Blue Super Glitch)

Set-up

Based on TheZZAZZGlitch's Super Glitch thread

1) Obtain an LM4 (Special stat 198) with the Trainer escape glitch.

2) Put LM4 in the first position. Have the first three of LM4's moves have 28 characters in total, e.g. BODY SLAM [9 chars], DOUBLESLAP [10 chars], WATER GUN [9 chars]. LM4 has Hypnosis, Water Gun, Doubleslap and Body Slam at level 7 in that order, so you just need to swap Hypnosis to the bottom.

3) Level up LM4 to level 24 with Rare Candies, in this spot to avoid a potential freeze, then replace its fourth move with Super Glitch.

Super Glitch safe spot.png

4) Go to the spot below, open your party Pokémon menu here, don't open it after then go to a battle with LM4 in the first position and keep opening and closing the fight menu until the corruption happens (this depends on luck). Repeatedly viewing LM4's summary from the spot below may also work.

IFCG spot 1.png

5) Run away. When you open your party Pokémon menu you'll notice you can go past slot 6 if the corruption happened. You actually have 124 (hex:7C) Pokémon now. Pokémon 1 and 2's species byte 1s will turn into Nidoqueen (hex:10), Pokémon 3's becomes Krabby (hex:4E), and Pokémon 4's becomes Missingno. (hex:50) but don't worry, putting them into the Day Care and out again later will bring them back to normal, and you actually 'need' Nidoqueen for the Yellow version of this trick.

Glitch

Notes:

Don't use the fossil conversion glitch to remove your LM4 as you still need to fix your name (add a terminator on or before the 11th character) to enable saving.

6) Fly to Cinnabar Island and go to the Pokémon Lab. Deposit a Fossil.

7) Select a Pokémon of your choice (the Attack stat modulo 256 will determine what the fossil becomes e.g. 21=Mew, 252=O (FC)) and switch it with the 33rd Pokémon. Go out of the lab and back in and you'll get a fossil Pokémon from the scientist based on the Attack stat of the Pokémon you swapped with the 33rd Pokémon.

8) Your Fly locations will become corrupted too; the relationship is PP move 4 and level (D18B/C) into D70B/C (Fly locations). You might even get glitch Fly locations that have bad effects, but we can fix that too; with the only catch being that you get all but one Fly location; you lose Fuchsia City. So, select Pokémon 122 (hex:7A). This is three spaces above the top Pokémon. Swap it with the 33rd Pokémon. Your Fly locations will be set to 7F 7F (this is taken from C4EF/F0 in RAM; some data which seems to be always 7F 7F on the party Pokémon menu. 7F 7F is 'good', you get no glitch Fly locations.

Get a reasonable amount of Pokémon

9) Replace LM4's Doubleslap with Mega Kick (via TM05, can be bought from Celadon Department Store) to get a total of 27 (1 less than before) real move letters. This is to put later screen data into earlier addresses.

10) Go to the spot below, open your party Pokémon menu here, don't open it after, then go to a battle with LM4 and keep opening and closing the fight menu until the corruption happens (this depends on luck). Repeatedly viewing LM4's summary may also work.

IFCG spot 1.png

11) Run away. If the corruption worked, you'll now have 16 Pokémon instead of 124 Pokémon; and 16 is a much more reasonable amount for when we deposit Pokémon later. Additionally, it's now only Pokémon 1 who is Nidoqueen, Pokémon 2 becomes Krabby, Pokémon 3 becomes Missingno. 50h.


Terminate your name (to enable saving)

Don't change your LM4 (should now be a Nidoqueen/LM4 hybrid for being in slot 1)'s moves.

12) Fly to Cerulean City and walk to the spot below:

IFCG spot 2.png

13) Open the party Pokémon menu here, don't open it after, close it then enter a wild battle and keep opening and closing the fight menu until you get corruption.

14) If the corruption worked, your name will now be blank. You're free to save and restart after talking to a nurse but cancelling out of Heal/Cancel.

Party clean up, fixing the option boxes

15) Fly to any town/city/Cinnabar and go to the Pokémon Center. Talk to the nurse but cancel out of Heal/Cancel. This will fix your option box which became glitched and could cause a freeze/corruption if it opened when you try to save.

16) Deposit Pokémon in the box. Try depositing Cancels until it doesn't work to make sure you have 6 Pokémon or something. Don't deposit Pokémon below Cancel or the game will probably freeze, as it did for me. Also, a weird 'blank name' Pokémon did this (from swapping Pokémon beyond slot 6 I believe), even when I withdrew it and Rare Candied it. Putting it into the Day Care and withdrawing it made it non-freezing though.

YouTube video

YouTube video by ChickasaurusGL