Final Fantasy X-2
-save everything (i.e crimson spheres etc.) until new game+ that way, you'll have items and abilities that will make getting every percentage point you can so much easier.
-watch every scene without skipping ever, they count too.
-in the far plane (first or second time, i can't member,) frantically press the X button for a scene where Tidus whistles or something. its very easy to miss.
Final Fantasy XII
-after you get to the final dungeon, the Bahamutt, i'm pretty sure the hunt Who's the Strongest becomes unavailable, so try to talk with Rikken (in Balfonheim) before that.
-each time Gilgamesh pulls out a sword is when he enters a new phase, so only steal once each time he pulls out a new weapon.
-do not use only three characters throughout the game. keep everybody at an even level because trust me, there are bosses that can kill a level 99 party in one hit. then you're left with a bunch of level 20 targets.
-be patient, this is a huge game.
-buy a gameshark you cheapo, or play fairly like everyone else <3