Would knock off/covet steal a mega stone?

Question

If Mega Sceptile had a Mega stone, and a Weavile used knock off, would Sceptile revert to its original form? Or would it just say it failed?

Answer 1

Knock Off cannot remove a Z-Crystal from any Pokémon, a Mega Stone or Orb if the target could use it to Mega Evolve or undergo Primal Reversion, or a memory if the target is Silvally.

If used on a Pokémon that cannot lose its held item—such as a Pokémon holding its corresponding Mega Stone—this move will not receive the boost.

Knock Off won't remove the Mega Stone and you won't get the boosts also.
So in your example, Sceptile would still have the Stone and would still be Mega. But no, the move won't fail.

Covet cannot steal a Mega Stone or Orb if either the user or the target could use it to Mega Evolve or undergo Primal Reversion, a Z-Crystal from any Pokémon, or a memory if either the user or the target is Silvally.

This also won't remove the Stone.

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Source 1
Source 2

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Hope it helped!

Comments

Thanks!

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You're welcome!

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Aw, man, I was hoping to kind of cheat the system and steal Steven's Metagrossite. But I feel better now, because I already fought and beat Steven, without trying to use covet