Gigantamax

Gigantamax is a feature appearing in Pokémon Sword and Shield. It is a variant of Dynamax; while any Pokémon can Dynamax, only certain Pokémon can Gigantamax. In addition to changing the Pokémon's size, it changes its appearance as well. It works similarly to Mega Evolution.

Pokémon capable of Gigantamaxing can typically be caught in Max Raid Battles, but are rare. Others, such as Meowth, are set to be distributed via events. Notably, Pikachu and Eevee capable of Gigantamax can be received if the player has save data of Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, respectively. Pikachu, Meowth, and Eevee capable of Gigantamax cannot evolve.

Also like Dynamax, Gigantamax also have its own Max Moves called G-Max Moves. 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.

Trivia

 * Only some special members from a Pokémon species are capable of Gigantamaxing, such as Corviknight and Drednaw.
 * Applin’s evolved forms having the same Gigantamax form could be either an error or intentionally done.
 * Melmetal and Garbodor are the only Pokémon that originate from certain Generations between Generation I and Generation VIII capable of Gigantamaxing.
 * There are certain Pokemon capable of Gigantamaxing that have something different no other Gigantamax Pokemon have.
 * Lapras is the only -type Pokémon capable of Gigantamaxing.
 * Machamp is the only -type Pokémon capable of Gigantamaxing.
 * Gengar is the only -type Pokémon capable of Gigantamaxing.
 * Charizard is the only starter Pokémon capable of Gigantamaxing.
 * Pikachu, Eevee, and Meowth are three Gigantamax Pokémon whose Gigantamax forms are not the final evolution of their evolution stage or Pokémon that have no evolution line.