Location name map distortion glitch (Generation II)
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Published on ● Video Link: https://www.youtube.com/watch?v=t_tjlRxbMnU
Notes: A short video, but to document an effect. You can use the location name of a glitch map to cause map distortion and enable walk through walls (similar to map distortion caused by glitch Pokémon summaries, glitch Unown, or a glitched party menu in Gold/Silver). This is probably caused by a buffer overflow from an extremely long location name. Sadly, at this point you probably have a way of walk through walls anyway (e.g. with arbitrary code execution from Pokédex mode 9 in this video).
You can display the location name from the Pokégear map or the new location notice (Crystal), and technically enable the map distortion/walk through walls without fully entering the map.