Does anyone know how to max out the characters including Yuna's attack stats?

- buy Clear Spheres
- battle Juggernaught at Monster Arena to get Strength Spheres
- clear EVERY +1/+2/+3 Strength sphere
- replace with +4
- re-activate
- repeat with any other stat you wish

the damage limit in 10 is 99,999. get your strength to 255 then attack with celestial weapon.