Oh man, let's see if I can remember. :'D
Diamond
Cherrim, Houndoom, Raichu, Empoleon, Staraptor, Garchomp
Platinum
Cherrim, Probopass, Vaporeon, Drifblim, Luxray, [hm slave]
HeartGold
Cherrim, Feraligatr, Ampharos, Crobat, Espeon, Gyarados
I will never be able to play a gen IV game and not use Cherrim. Never.