K, last set I tested the other day.
Shandy @ Balloon!
Flash Fire ftw.
Timid, 252 SpA / 6def / 252 speed
~Nitro Charge
~HP Ground
~Fire Blast
~Shadow Ball
Feels so damn good to come in Heatran with impunity, since I'm immune to 3/4 of most Heatran's movesets (Fire blast, earth power, and explosion). I can happily spam Nitro Charge on the switch and procede to dent everything before forced to switch out or get revenged. Kudos if you manage to hit Doryuuzu with Fire Blast in the switch.
Anyway, with 4 immunities you have a relatively easy time switching in, provided you have a nice spinner. I paired it with Starmie, but that was a terrible idea (pursuit weakness much).