Pikachu

Whenever Pikachu comes across something new, it blasts it with a jolt of electricity. If you come across a blackened berry, it's evidence that this Pokémon mistook the intensity of its charge.

This Pokémon has electricity-storing pouches on its cheeks. These appear to become electrically charged during the night while Pikachu sleeps. It occasionally discharges electricity when it is dozy after waking up.