I disagree, Volcarona is AWESOME. Easily one of the best fire-type and best bug-type pokemon that is not an uber for battling.
Edit - Get Flamethrower/Fiery Dance, Bug Buzz, Quiver Dance, and one other move (e.g. Psychic) and you're good to go.
Edit 2 - Just to tell you how awesome it is, I used Volcarona in a Battle Subway team in White 1 and got a >50 streak as a result. I went with a focus sash on it so that it didn't die to a physical rock-type attack or a critical hit after starting off with Quiver Dance. --- I only deal with 100% legit/uncloned pokemon in trades.