Actually, I believe that metal Silvally was a thing. I don’t know much about now though.Here's my entry!
Artwork by All0412: Type: Null
Blanks and Energy by @aschefield101
Holofoil by @Nekoban Ryo
Ability: Tapu Lele (Lost Thunder), Gabite (Forbidden Light)
Attack: Carbink (Lost Thunder)
Idk how viable Silvally-GX, but my thoughts was to just make a Type: Null that would make it easier to play Silvally-GX haha so there's not much else to say haha