Bulbapedia says a 'purification glitch' can also be done in Pokémon XD under different conditions. I think I remembered it being another infinite walking trick from indoors, but I don't know the specifics.
Does anyone remember? Thanks!
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Kind of unrelated, but this is a cool timing glitch with the purification chamber: https://www.youtube.com/watch?v=ztg-_c5R6oI