Gigantamax is a special transformation in the Pokémon series that allows certain Pokémon to grow to an enormous size during battles. This transformation not only increases their power but also changes their appearance and grants them unique moves called Gigantamax moves. To use Gigantamax, a player must have a Dynamax Band and be in a battle setting that allows for this feature. Not all Pokémon can Gigantamax; only specific species have this ability, making them more valuable in competitive play. Gigantamaxing lasts for three turns, after which the Pokémon returns to its normal size.