Urgh, may I have one battle without type/evolution disadvantage :'D
Doesn't matter I guess, you'll do your best Chocofresh!

Prevent the nasty healing later on by unleashing Toxic on him!
After that, protect against the Hydro Pump and use Attract to stop the Surf!
Use your chocotastic charm! (Oh god that sounds so wrong)

[Toxic ~ Protect ~ Attract]