Volcarona is pretty awesome although I probably haven't played a competent opponent with one, as I don't ladder too often. He requires a fair bit of team support (Rapid Spin and elimination of Rain) but the rewards can be great. Tentacruel and Starmie are good partners because they can remove rocks and solidly counter Heatran, Tenta in particular as he can also lay down TSpikes to weaken Blissey/Chansey.
Volc's biggest enemy is the team preview. Anyone playing against it knows the importance of keeping rocks up. It's probably better to build an offensive team for it, that way there's little chance your opponent will be able to get rocks up again or Phaze things.
Volc's biggest enemy is the team preview. Anyone playing against it knows the importance of keeping rocks up. It's probably better to build an offensive team for it, that way there's little chance your opponent will be able to get rocks up again or Phaze things.