I beat the Giant Battle medley on my first try! I was so nervous at the end. EarthWake X had stalled me a lot (because I didn't do enough damage to him when he fell in the water the first time), and I was really scared that I would run out of turns.
The Bowser X part made me really nervous, because it took me a lot of tries to beat him normally. But somehow I pulled through, with only a sliver of health left! My heart is beating really fast... --- "So, um, I really want to help. I'll be good, really!"
Congrats! Honestly, I'm not touching the Giant Battle Medley at all. I don't mind redoing the fights individually, but the medley just looks like hell. And I didn't enjoy the Giant battles as much as BIS.