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GIGANTAMAXING is the real gimmick. The forms certain Pokémon can take make them look much more Kaiju like, such as Nidoking gets much more armor plated and his eyes become pure white, Blastoise gains large lower tusks and Bisharp becomes Ultraman.
Dynamaxing is just so Pokémon without Gigantamax forms can stand a chance.
It ties in with the giant on the hill, it created Gigantamax titans, with Dynamax being a side effect.