Dynamax is a phenomenon unique to specific locations in the Galar region, where Pokémon are able to take on gigantic appearances. Dynamax Pokémon become tremendously strong and their stats get a boost but they will return to normal after three turns.
Only certain species of Pokémon can Gigantamax—and even among such species, only rare specimens will be able to. Gigantamax Pokémon become bigger and it boosts the power of the Pokémon. It also allows each Gigantamax Pokémon to use a unique move known as a G-Max Move!