Why does Marshadow change form before attacking?

Question

Ever since Marshadow was revealed and it was leak, this question has been driving me nuts
How come Marshadow changes it's form before initialising an attack?

Comments

I don't think Marshadow changes form. Can you show us a video of Marshadow changing form?

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I think he is referring to Marshadow's "cape" and the wispy top changing color,

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https://www.youtube.com/watch?v=Y4V1Ixfb1RM
It only occurs when using Marshadow's Z-Move, though.

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What kind of answer are you expecting?

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If it's about the z-move, I think a lot of Pokemon transform as part of z-move animations.

Answer 1

Probably for that special look. It is a legendary/mythical Pokemon and a fighting type so it needs a flashy look meant for a champ (I was just thinking about Machamp XD)