There is a secret meteor tag team. Hokuto and Kairi. To do the meteor tag combo be Hokuto and do "trance". To do it do diagonal left 2 times and then kick. Finally do low punch, low punch, back, low kick, high punch with Hokuto to see one of the best moves in the game.
Keep your characters overdrives at full. That way when you go up against a boss or a hard enemey you have the upper hand and have the ability to unleash the powerful attacks that they bring early in the battle. Also keep all of your aeons at overdrive. By the time all of the overdrives are gone the boss is eather dead or will go down in a few more turns!!