Ultra-sun: Its nature is to store up electricity. Forests where nests of Pikachu live are dangerous, since the trees are so often struck by lightning.Moon: It’s in its nature to store electricity. It feels stressed now and then if it’s unable to fully discharge the electricity.Alpha-sapphire: 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.