Infinite items
Talk to the man who teaches you to catch Pokemon then fly directly to cinnabar surf along the very edge only.
When you see a missingno you now have infinite of the item in your 6 slot WARNING do not catch Missingo it may currupt your file however if it doesnt it will evolve into a kangaskan that knows fly also you may find Pokemon over lvl 100 such as mewtwo snorlax chansey possibly a Mew (very rare) and many more.
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