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One final proof for all the idiots who keep claiming the mask is a permanent part of its body.
It is also clearly visible that the reason the RKS system isn't usable is due to the mask constraining Sylvally and disabling it from using it.
The stats go up because the mask restraining is gone.
The ability can be used because the mask restraining the ability is gone.
Appearance-wise, the two Pokemon are completely identical except for the mask.
Why is it an evolution in the games? Who the fuck knows. It is literally a form change (and even that is stretching it cuz only the mask comes off).
tl;dr - Gamefreak fucked up.
