Although the difference may not mean much, there is a notable difference between the two terms. Both Gigantamax and Dynamax allow for a Pokemon to grow and become more powerful but unlike Dynmax, Gigantamaxing a Pokemon changes both its size and appearance. Gigantamax replaces the Dynamaxfunction within Pokemon: Sword and Shield. Only certain Pokemon in the game can Gigantamax, which means that you may miss out on this feature entirely. The Pokemon who are able to Gigantamax may seem like a long list, but they comprise of only a fraction of the Pokemon in Sword and Shield. On that list are Snorlax, Charizard, Pikachu, Eevee, Corviknight, Lapras, Blastoise, and many, many others.