Here's my Gigantamax Pikachu redesign. I'm really proud of it! I decided to keep the fat Pikachu design and the electric tail, but also took inspiration from electrical wires, radio antennae and electric batteries. Unlike Gigantamax Eevee, I am a fan of the original Gigantamax Pikachu, but I still wanted to make my own spin on it.
G-Max Move: G-Max Volt Crash (remains the same)
Pokédex information: When Gigantamax Pikachu roars, it releases thousands of volts from its tail and cheeks. The electricity from the former then gets controlled by Gigantamax energy to create an electric tail, which is one of its main "weapons" in battle. Gigantamax Pikachu is considered one of the most dangerous Gigantamax Pokémon to own for this reason.