Sea Serpent

A final evolution of a Water Spirit. They can be evolved from Water Fish or Orb Fish into two types, a Strength Level Type that learns Bite or a Dexterity Level Type that learns LongJump. It has a prerequisite of 3+ strength genes, and for reason. In terms of pure Strength it is the most powerful in the game, with a base stat of 7 (matched only by Mantis) and a growth of 2.0. Its deadliness is only enhanced by its cleaving attacks that inflict both Poison and Bleeding.

If you're evolving them from Water Spirits, you might want to consider evolving both types so you can fuse away Splash for a better skill set.

Drops Scales and Fangs.