Hmm, now, let me see . . .
My first and favourite is my Dragonite, raised from a level 16 Dragonair. Then Charizard, which I migrated from a friend's file on my FR at level 88. Then Ninjask, which was hacked to level 70, and I raised it the rest of the way, and Aggron, which was hacked at level 100. They're both legal, and I never use either of them in battle, really. My Tyranitar was raised from level thirty-something to 100.
Yeah, five. But I have a whole lot more which are close. Salamence and Blastoise are 86, and my entire Platinum team (consisting of about seven or eight Pokemon on a rotation scheme - Absol, Lucario, Gardevoir, Infernape, Gyarados, Gengar, Scyther, and maybe one more I forget) are all between level 80 and 84, slowly being trained on Gym Leader rematches. @_@