All on Episode 15: (the joys of summer vacation)
Julia: 3 tries, it took a little while to figure out how to get around all the explosions.
Florinia: 2 tries. Chimchar is a useful starter.
Corey: 10 tries. This is the point in the game in which I discovered that my team was full of a bunch of crit magnets.
Shelley: 2 tries, Monferno really carried his weight.
Shade: I stopped counting. Golett is freaking sloooooow.
Kiki: 3 tries, that Medicham outsped my whole team.
Aya: 5 tries, all of those doubles attacks were hard to get around. Icy Wind...
Serra: 7 tries, shouldn't have showed up with half my team weak to Ice.
Noel: 2 tries. I played in an earlier chapter and ragequit because I would throw my whole team at that infernal Cincinno and lose. I assume he got nerfed.
Radomus: 2 tries, his Psychics were not prepared for the Emolga/Golurk Discharge/Earthquake double duo.
Luna: 3 tries, the trick was getting Infernape and Gardevoir to hold out.
Samson: 1 try. He only landed 2 hits in the whole fight.
Charlotte: 8 tries. Got bailed out by Trick Room Gardevoir, used Rhyperior and Golurk for a dual Earthquake (plus Rhyperior's Stone Edge) to clean house almost untouched.
Terra: 2 tries, would've been one if I'd had the foresight to grab something with an Ice-type attack.
Ciel: 6 tries, took me 5 to figure out I needed Durant at full HP to deal with that rotten Mega Altaria.