Final Fantasy X Cheats

Charge Tidus Overdrive Guage Fast
Go to the dome at the Zanarkand ruins and set hisoverdrive to slayer. Fight the fallen monks (zombie) and kill them. when you do his overdrive guage will charge double. ifyou use energy rain on 3 fallen monks (3rd overdrive) his overdrive guage will instantly be full agin. this is what I did to get blitz ace.

Alternatively you can use zombie attack on any other fiend but I found this works best.