FusionDex

Dhelceus uses its vast powers to tear apart shipwrecked remains and reform them into undersea castles to house itself within. It can generate tendrils of super-strong seaweed to restrain those who would dare trespass in its domain.

It is described in mythology as the Pokémon that shaped the universe with its 1,000 arms. The soul of seaweed adrift in the waves became reborn as this Pokémon.