LogFAQs > #976987177

Most of the UX stages aren't really any more difficult than finishing them the first time, and you've probably got most of the good options maxed out at that point. Though after you get to the back half of the game you might have to use a +5 moves and/or attack up more regularly on stages with low move limits or don't really have any good options to deal with them due to the type matchup, and then with later legendary/mega stages you'd probably have to drop a complexity powerup too (but you probably would have had to do that the first time too with a lot of the later ones).

The hardest part was the expert stages, where I had to use a full set up of powerups plus continuing with crystals multiple times to get the last couple of them.