FusionDex

Joltgast is a beach-dwelling prankster, pretending to be a sandcastle until something ventures too close, whereupon it shoots out little bits of pointed fur charged with electricity. It dives beneath the sand laughing as its victim gets shocked.

It likes the shovel on its head, so Joltgast will get serious and fight any children who come to take it back. Its cells generate weak power that is amplified by its fur's static electricity to drop thunderbolts.