I kind of like this Charge Beam set:
Hydreigon@Life Orb
Timid/Modest
252SpA, 252Spe, 4HP
Charge Beam
Dragon Pulse
Flamethrower/Fire Blast
Surf/Earth Power
Bring this in on something that fears Hydreigon and Charge Beam on the switch. People are less likely to expect a Charge Beam...