Not counter, but check/revenge kill. It's got good bulk, though.
I'll still admit it's overrated, but it could work.
Yes counters, the whole point is it needs to switch to lose it's boosts.
@ Complete Legitamacy - Heatran cares about type matchups when at +6 I think, depends on what moves you run. People would also be more careful switching with chandy around, I would guess they'd often try and get early game sweeps w/ taunt for set up chandy and another choice/ heatran for choice chandy. Just a prediction.
Also Ditto as a scout? You might be able to completely destroy their team if you know most of their movesets and base stats.
EDIT: Not Heatran, that was just a derpish idea of mine. Dugtrio might get more popular as a revenge.