Narin said:Short Answer: No
Though what you can do is patch the GBA Rom manually before transferring the game over to the 3 in 1 with the cheats you want. Theres several topics about this but the program is called gabsharky.
Searinox said:It's been posted before. The 3 in 1 does not support cheatcodes period. If you want cheats in your ROM you're going to have to patch it on the comp with a tool, and assign a shortcut key for enabling or disabling them, you WON'T have a menu to conveniently select which to enable when you see fit during the game.