Duplicating Items (Missingno)
To get 99 of any item, first put the item you want to multiply in the sixth item slot. Now go to Viridian City. Talk to the old man almost all the way north of the town. When he asks if you are in a hurry, say no and watch him catch a weedle.
Right after that, fly to Cinnabar Island, swim up and down the beach on the eastern coast until you run into a Pokemon called "M" (Missingno.) Once you see him, kill him or run away. DO NOT CATCH HIM! After that, you should have multiple copies of your sixth item!
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