(Still trying to come up with details about the marmite polteageist. Just thought it'd be fun. Thinking the evolution should involve toast.)
Wobbegunk, the melting shark pokemon. (Based on wobbegongs)
Wobbegunks tend to spend their days moving slowly, or not at all. They hide on the ocean floor and wait for prey to swim overhead. Then, they launch upward in a swift gulp. Their soft raggedy bodies make it easy to blend in with the general clutter of the ocean floor. If in danger, though, they can dart away with sudden speed. If their attacker proves to be too much for them to escape by merely fleeing, they begin to seep out a noxious and bitter ooze that clouds the water around them.
by Spuzzle91