From Bulbapedia, the community-driven Pokémon encyclopedia.
Dynamax (Japanese: ダイマックス Daimax) is a temporary transformation affecting Pokémon that was introduced in Generation VIII. Trainers who obtain a Dynamax Band are able to Dynamax their Pokémon. According to Professor Magnolia, the Pokémon distorts space to change it size while affecting the world around them.
Dynamax was created from Eternatus when its energy leaked through it while it slumbers to recover from its wounds. This resulted in several power spots that are used in the Gym Stadium to to trigger the transformation.
Dynamaxing increases a Pokémon's size drastically, as well as changing the moves of the Pokémon and increasing their stats in battle, but can only be used once during a battle, and lasts only for three turns. In addition, it can only be performed in certain areas, such as special arenas in Gyms.
Dynamaxing provides Pokémon with an increase to their maximum HP (unless it's Shedinja). The amount of HP gained depends on the Pokemon's Dynamax Level, which can be increased with Dynamax Candy. At Dynamax Level 0, a Pokémon will gain 50% of its max HP. For every Dynamax Level above that, up to a maximum of 10, the Pokemon will gain 5% more HP, up to a 100% increase at Dynamax Level 10.
All moves that a Pokémon knows will turn into Max Moves, which are more powerful than regular moves. The Max Moves that are learned are determined by the moves that the Pokémon knows.
Wild Pokémon in a Max Raid Battle start out as Dynamax Pokémon, and do not return to their original state during the battle. However, the Trainers' Pokémon do not start out as Dynamax Pokémon, and only one of the Trainers' Pokémon can Dynamax during the battle, and only for three turns.
Certain Pokémon can undergo a special kind of Dynamax known as Gigantamaxing. Only specific individual members of a select group of species can Gigantamax. Unlike normal Dynamax Pokémon, Gigantamax Pokémon have a different appearance to their regular form in addition to being larger, and have an exclusive Max Move known as a G-Max Move.
Zacian, Zamazenta and Eternatus can't dynamax because the button won't appear.
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