How do you get different overdrives from Final Fantasy 10?

Answer 1

that depends on the character.

For tidus, you have to use his overdrive alot. (total is 80 times for unlocking all overdrives)

For wakka, you have to win then in the blitzball tournaments.

For auron, you have to find videospheres left by jeckt and braska.

For Yuna, the aneons are the overdrives.

For rikku, mix different items.

For Kimahri, you must lancet them from different creatures.

For Lulu, the spells are the overdrives.

To get specifics, find a guide on overdrives.