Catch any wild Pokémon: 01XXd8CF(XX is the Pokémon)
Code info: This code will let you fight any Pokémon wild. It replaces lets say a L10 Pidgey with a L10 Mew. The Mew only knows the moves it naturally learns up to L10. This code has been known to erase data on the rare occasion. Some Pokémon have garbled pictures while battling. If you try to battle a Trainer/rare Pokémon or trade with a computer character the Pokémon you fight/get will be the wild one you put the code in for. This code is handy for catching Pokémon such as mew which cannot be obtained fairly (Unless you are one of the 151) but otherwise true blue cheaters only will benifit from this. A hexidecimal listing(that's the XX) of the pokémon can be found here
Safety Factor: 2/5
Usefulness Factor: 5/5
Cheating Factor: 5/5
Fairness Factor: 1/5
Get All 8 badges without doing anything: 01FF56D3.
Code info: This code will give you every badge therfore taking away the point of the entire game. Useful if you have finished the game and want to mess around. No glitches have been recorded using this code.
Safety Factor: 5/5
Usefulness Factor: 4/5
Cheating Factor: 5/5
Fairness Factor: 0/5
Get any item in store: 01XX7CCF.(XX is item)
Code info: This code will let you buy any item in stores. people who have messed around with the code have had game files wrecked so if you stick to the item codes here to replace XX you should be ok. This is also another game-ruiner. Getting things such as M.Balls and Rare Candies ruins the game the first time round. Once again use only if bored not if you are stuck on a GYM leader (Which you shouldn't be really)
Safety Factor: 3/5
Usefulness Factor: 3/5
Cheating Factor: 5/5
Fairness Factor: 0/5
Infinite Health: 01FF16D0.
Code info:This code si for desperate people ONLY. For one this code has a big chance of screwing your game as it makes your health bar go off the screen. if you like to cheat (A LOT) and want to gamble your Pokémon Save File then OK but don't complain to me when your game gets wiped
Safety Factor: 1/5
Usefulness Factor: 2/5
Cheating Factor: 5/5
Fairness Factor: 0/5
The below codes have not been fully tested and analysed so use them at your own risk
Infinite Money: 01FF47D3.
Infinite Casino Coins: 0199A4D5 0199A5D5.
Infinite Safari Balls: 016447DA.
Infinite Safari Time: 01F00Ed7.