Trainer escape glitch: Difference between revisions
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→Viridian Forest arbitrary text box
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Exclusively to Yellow, the Town Map in the house with Speary the Spearow (predefined text box 0x41) will load an arbitrary text box from C331 in RAM. This is the x-position of OAM entry 13 (decimal) (FE31). OAM entry 13 will vary, sometimes depending on which NPCs are visible on the screen (if not all NPCs are present), it will correspond to the x-position of the left-half of the note on the wall about Speary instead. It is possible to manipulate C331 to values which are not actually on the screen. i.e. when Speary walks left off the screen, the game may load a very high x-position for it into memory.
In speedruns, this is manipulated to be 0xFE, because the starting 0xFE is a text command to open a Poké Mart; which can then be used for further glitches as part of the process to warp to the Hall of Fame (such as buffer overflow of the mart due to late 0xFF byte or the use of glitch items such as [[ItemDex/Y:089|4F]]). The tile number of the NPC corresponds with the number of items in the Mart, and the rest of the OAM data which follow (including for entries 14 and onward) control individual items which appear in the Mart.
The run usually includes a lot of luck manipulation. On the forums (see [https://archives.glitchcity.info/wiki/Pok%C3%A9mon_Yellow_reverse_badge_acquisition_no_underflow_route.html this thread for context pertaining to Pokémon Yellow reverse badge acquisition no underflow route]), luckytyphlosion also offers the following backup strategies:
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