Why does machamp, weavile and darkrai get new looks in pokken?

Question

machamp and weavile gets new design after burst and if you land a dark void on darkrai he looks different

Comments

I'm pretty sure that's the whole point. Not all Pokémon in the game have Mega Evolutions, so when they use Burst, they may have different appearances.

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What about pikachu or decidueye?

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Idk. I guess whether to change their appearances or not was just a decision made by the producers.

Answer 1

When a Pokemon uses a burst they output a lot of energy causing them to also mega evolve in the process, so Pokemon without mega evolutions dawn a new appearance to show their radiating power.