Cheats

99 of an item---First talk to the guy the showes you how to catch pokemon, after he shows you fly to cinnisibar island, change to item you want 99 of to the 6th place(if you don't know how to do this press the select button on the item, move the arrow to the 6th place and press select again) then surf up and down the east shoreline(half on land half on water) till you fight missingno, just run away and you will have 99 of that item. Note: This will not work on pokemon yellow becuase they took missingno off the game.

Topegi---To get topegi you need to have the itemfinder. First walk around MT Moon and in 100 diffrent spots use the itemfinder, on the 100 spot it will say you found an egg, after a while to egg will hatch into topegi.

Pokeball cheat---When you use any kind of pokeball hold b and up right after it leaves ashes hands, if done right it will work just like a masterball.

Mew---To get mew take a magikarp to the daycare guy and leave him there tell he is level 50, when you take him out he should be mew. Note: This only works in pokemon yellow.