Dokokashira door glitch: Difference between revisions
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In order to alter the wrong warps every four steps, three criteria are necessary.
*The 199th Pokémon must be poisoned (F337 (Echo RAM for D337) must have bit 0x3 set; as it does for the 0x0C value loaded into D337 upon entering Pallet Town). Note that even though this Pokémon is in fact poisoned, the poison screen transition/sound effect may not occur. D337 is the x-coordinate of the Professor Oak's laboratory door warp.
*F334/F335 (D334/F335) (the 199th Pokémon's current HP; 0 to 65535) must first be a 16-bit value greater than 0 (otherwise the wrong warp is always Pallet Town because poison does not underflow a fainted Pokémon's HP).
**Additionally, if it is possible to adjust F334 to a value over 0 (so F334-F335 represents 256*n as the HP where n>0, it is possible to access relatively high warp IDs as in this case, F335 will wrap around from 0x00 (Pallet Town) to 0xFF ([[AreaDexJP/RG:255|glitch map 255]]) and below whenever F334 is decremented (a loss of 256 HP). From 0xFF it will take 255*4 steps to become 0x00, after which taking another four steps decrements F334 by 1 and sets F335 to 0xFF. This process of having to walk 256*4 steps to underflow from 0x00 from 0xFF repeats, until F334 becomes 0x00 as well - from there on the wrong warp is always Pallet Town as above.
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