Then go to Cinnabar Island and surf on the side. Adventully you will run into Missingno. Do not catch him it can screw up your game and make you lose saved data. First use the Missingno cheat. After running into Missingno keep surfing and adventully you will run into an over level hundred pokemon.
Name varies the pokemon.
You can catch them but if they get any experience even one point they will grow back to level hundred. You can use them in battles against your friends. This code works, it depends on your name and game type for what pokemon you get. Do the Missingno cheat and your 6th item will be duplicated. If you hold the a button when it says blank used an attack untill the damage stops you will get more damage than normal.