hi well i have all of those pokemon ya see what i did was i whent to wal-mart or you can go to most any video game stores and bye one it is called a action replay you put ds games in it and you get cheat codes heares what you do: like i said before go to a video game store or wal-mart and bye one ( they cost 20.00) then go on to askcheats.com and type in the serch box pokemon diamond or pearl ( or what ever one he has) it should tell you what to do. but if you cant find it just tell me and i will tell you a step by step guide on each pokemon.
hey hope i could help