A Dynamax Raichu.

Dynamax (ダイマックス Daimakkusu) is a new game mechanic in Pokémon Sword and Shield. It can be used with the Dynamax Band item, and allows a Pokémon to grow in size. It lasts for 3 turns after going away and can only be used once per battle, similarly to Z-Moves. There also a different variant of Dynamax called Gigantamax and the exclusive Eternamax, which not only increases their size but their appearance as well, thus making both Gigantamax and Eternamax work in a manner similar to Mega Evolution.

A Dynamax Band.

Upon being Dynamaxed, their attacks are Dynamaxed as well, which is known as Max Moves, becoming different and more powerful. They change depending on their type and what they do.

Dynamaxed Pokémon can also appear through Max Raid Battles. These Pokémon appear at alters and can be summoned by multiple Trainers. The type of Pokémon that appears depends on different factors, including the setting or the weather. For instance, Dynamax Lanturn may appear when it is rainy or in a water-like area. Certain Pokémon can only Dynamax at certain levels.

Anime

Ash and Goh witnessing the Dynamax Phenomenon.

Dynamax was first seen in "Mind-Boggling Dynamax!," where Ash and Goh witnessed a Snorlax Gigantamaxing in the Wild Area and had to figure out a way to stop an incoming train from colliding with it.

Gallery

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