Character from pokemon-journeys by
Ash's first partner -- the Pallet Town Pikachu who refused a Thunder Stone, survived every region, and in Journeys learns to Gigantamax into a stubby pre-evolution giant.
Pikachu is the emotional engine of the entire series disguised as a rodent. It refuses Poké Ball containment, rides on Ash's shoulder as standard operating posture, and treats new Pokémon with a mix of suspicion and parental patience depending on threat level. Under pressure it doesn't panic -- it plants its feet, lowers its center of gravity, and braces for a move that should not be survivable. In Journeys Pikachu is at the peak of a career that has taken down Latios, Regice, and a Tapu. It knows every trainer in its general vicinity, handles new recruits to Ash's team like a senior officer, and tolerates Rotom Phones the way a cat tolerates a new vacuum. Its Gigantamax form unlocks in Galar and it uses it sparingly, aware that the stubby giant silhouette is both a surprise and a signature. The final Leon battle is Pikachu's stage -- one last Thunderbolt against one last Charizard, from the Viridian Forest starter all the way to the Monarch's throne.
A yellow Mouse Pokémon with black-tipped ears, red cheek pouches perpetually crackling with static, a lightning-bolt tail, and two small stripes on its back. In Gigantamax form it swells into a towering pudgier shape with a bolt-shaped tail fan -- the original Pikachu silhouette from Red and Blue. Stands upright on Ash's shoulder as often as on the ground, tail flicking, ears tracking noise before it consciously hears it.