Double AP

[Nebulance]

Oh, I remember cycling through my party during the main game, having them defend once, and retreating back for someone else. It made my game so much longer, but everyone levelled up equally.

I did something similar -- instead of bringing everyone into the fight, I'd cycle them -- every time someone got a sphere level, I switched them out with someone from the sideline. It takes a while, but it mixed things up and kept it entertaining.

Although, this applies to leveling up in general and not necessarily reaping the benefits of double AP.