>>44138957Chandelure or Dhelmise/Jellycent.
The first for being a life force eater and Dhelmise/Jellycent for being deep-sea Predators, Dhelmise might win in the end just because it's basically a ghost giant Siphonopore that hunts Wailord while being one of the largest Pokemon ever, it's kind of a combination of Siphonopore and predator Algae.
It's the closest we will ever get to the black carpet of /x/ in Pokemon form.