yes i know how in general, but not how to do it, its hard to do it on your own unless you are a programmer, iin that case, you'll need to learn ARMXXXX the Xs being replaced by weird numbers and letters which have escaped my mind, this is the ASM (Assembly) Language, and helps you edit the very basis of pokemon games, other then that, you can't, you can however, insert 25 new pokemon, between 251 and 276, the only prob being, they will not appear in the pokedex !!