It's alright. Interesting typing and ability, but you get it so late in the game that you've probably got an established team by the time you find it, and it's in an area where it has a type disadvantage against many of the wild Pokemon.
Interesting Pokemon and concept, but I've never used it thanks to the relative difficulty in obtaining one since you have to trade it twice with rare items.
Whoops got ninja'd. Wobuffett is funny and surprisingly useful.