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This is a glitch I've discovered years ago. There's a way to remove Snorlax from the overworld in the Generation 1 Pokemon games, which bypasses needing to get the PokeFlute. It involves using the long trainer glitch, so you'll need to be sure you have trainers in the overworld you haven't fought yet. Here's the description I typed up. Note this was from 2010, I still haven't had a chance to actually look at a debugging emulator to see what's going on in real time.