
Reusable glitched box walk through walls method for Pokémon Yellow (Box Pokémon 145)
Notes in video and here:
A combination of a previous glitch I came across https://www.youtube.com/watch?v=7Mg86azYljU and some general experimentation with the expanded PC box.
This glitch gives you a repeatable way of setting up walk through walls (another alternative to the old Safari Zone and ledge method). Once it's set up, it's really fast to repeat, but you need a way of escaping the map/Pokémon Center like blacking out due to a fainted party or changing item 37's quantity to 0 and Flying away.
It should work in Red/Blue but I'm not sure of the right PC box needed (this glitch abuses box 13 which writes the number of PC Pokémon to 113 at first (from somewhere in ROM. Hopefully it is the same pointer and address each time/I did this glitch in Viridian City).
Walk through walls is activated after depositing the 145th Pokémon, which must have at least 255 Attack stat experience. You don't have to use the box breaker glitch to get the glitched box, and can instead use arbitrary code execution to set DA7F to 144 ($90), but if arbitrary code execution is possible so is writing to CD38 (walk through walls) directly. Still this could be used if you want to set up multiple things (e.g. both an instant walk through walls method, and a ACE set up for a different purpose).
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