From Bulbapedia, the community-driven Pokémon encyclopedia.
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 increasing their stats in battle. Only certain species of Pokémon can Gigantamax, and when they do, their appearance changes significantly, unlike regular Dynamaxing.
Even within species that are capable of Gigantamaxing, only certain individuals can Gigantamax. When an individual Pokémon capable of Gigantamaxing Dynamaxes, it Gigantamaxes; other individuals of the same species Dynamax as normal. Pokémon capable of Gigantamaxing can be caught in Max Raid Battles, but are rare.
In their Gigantamax form (Japanese: キョダイマックスのすがた), Pokémon can use a G-Max Move. Each G-Max Move is exclusive to a specific species of Gigantamax Pokémon. All of a Gigantamax Pokémon's moves of a certain type turn into G-Max Moves.
In other languages