uhh I think i have the same problem
i tried that method changing the usrcheat.dat to cheat.dat
i downbloaded the usrcheat.dat from gbatemp too
i checked the "game enabled" on the r4cce
the codes showed but even though i checked it, it still doenst work
like when i (x) one in pokemon soulsilver...
and before anyone asks who that robot is, it's actually from an episode of the donkey kong cartoon, where dk ends up accidentally switching bodies with it, and there's a banger song in that episode that you may have heard before in a thread