FFVIII: I used the trick of not leveling up until I got the stat bonus junctions, and then leveled everyone up like that. I maxed everyone's stats with junctions, I didn't really feel like doing it for real. Maybe I will one day.

FFX: I have maxed the sphere grid. I did the trick in the Omega Ruins to open all 12 chests to get the 99 Warp Spheres, which made it rather easy.

Kingdom Hearts: It takes a while, but I have maxed Sora's stats in Kingdom Hearts. You just have to collect enough items and have the moogles make stat raising items. To have the maximum MP possible you have to choose the staff at the beginning and be wearing 3 Atlas Armlets. Gravija ftw. I have yet to max Donald or Goofy's stats.

FFIX: I am in the process of "maxing" stats in a perfect game here. I say "maxing" because it's not really possible to max stats in this game. You can max a stat, but to max one you kind of have to give up on others. With the exception of Zidane's speed stat, the only stat that any character can max in the first place is spirit, which maxes at 50, so everyone is maxing spirit and getting as large a stat as possible in the other stat they use the most. This is a detriment to some characters, like Quina who starts with a measly 11 Spirit. But for other characters it's not so bad, like Steiner, who can max his spirit and come one point shy of the maximum strength he can possibly have.