Gigantamax Eevee was officially revealed by CoroCoro Comics, then in a video on October 16, 2019, along with Gigantamax Pikachu, Gigantamax Charizard, Gigantamax Butterfree and Gigantamax Meowth.
As Gigantamax Eevee, it has become larger and more fluffy. The fur collar becomes longer with several triangular furs pointing straight up. The right ear has three red clouds surrounding it like a circle. Due to the fur becoming fluffier and luxurious, any enemies caught in it will lose the will to fight due to being enamored by its presence. Due to Gigantamaxing, Eevee becomes even more playful and rambunctious, desiring to play with its opponent and often unintentionally crushing them with its size.
Gigantamax Eevee is the only known Pokémon capable of using the exclusive G-Max Move G-Max Cuddle.