Underwater Field, if it's in a gym match is gonna be the most annoying thing ever. Quartered Speed, non-water physical damage HALVED, damage each turn, Whirlpool doing 1/6 health AND confusing. Geez, if we have to go through that in a Gym there will be tears shed. Wait, there's an optional battle with El's Snorlax? Fairy's too good a counter against Dragon. They probably won't get a boost in the field unless you make it Rainbow Field or something.