Unlimited items
When you have fly and surf put the item you want unlimited (e.g. Masterball) in 6th place in item list, fly to viridian city, talk to the guy that earlier said he was havinga coffee and wouldnt let you, if he asks you are you in a hurry answer yes.
Immediately fly to cinnibar island and surf up and down the right side of the island, you will find a Pokemon called misingno, don't catch it it will corupt your game, after beating or running away from it you will have unlimited items in the 6th place, repeat with other items to have unlimited of them aswell.
Although they eventually run out, just repeat the cheat for the same effect. (you can also find Pokemon of over level100 doing this. REALLY!
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