Gengar Gigantamax

Gigantamax (Japanese: キョダイマックス Kyodaimax) is a special kind of Dynamax introduced in Generation VIII. Like other Dynamaxing, Gigantamaxing increases a Pokémon's size drastically and its HP in battle. Only certain species of Pokémon can Gigantamax, and when they do, their appearance changes significantly, unlike regular Dynamaxing. As revealed by Professor Magnolia, the Pokémon distorts space to change its size while affecting the world around them while altering their appearance drastically.