for the two starters ur after theres a pokemon modifir code so all u have to do is put it in then hit l and r onces u do that then toss the numbers of masters balls to the nasial dex after that toss the ultra balls to the make the level u want them to be and then hold the l button and then walk into grss as for the exp code u shuold be able to find it as well
in the action replay code area as well.
hope this helps u get what ur after and good luck