Can you Knock Off a Mega Stone from a Pokemon who haven't Mega Evolved?

Question

Say some carless dude forgets to mega evolve then a Pokemon like sabeleye used knock off will it knock off the mega stone?

Answer 1

Normally, knock off would deal extra damage to a Pokemon with an item and then take it away. Mega stones however, can not be knocked off, only if the mega stone is being held by the respective Pokemon - don't know why some one would have it on a different Pokemon.

Other qualities that knock off doesn't work on are:

• girantina's griseous orb
• plates for arceus
• drives from genesect
• Pokemon with sticky hold
• Other items like focus band would activate, then get stolen

Stolen items will return in the end!

Hope this helped!

Answer 2

>If used on a Pokémon that cannot lose its item — such as Giratina holding a Griseous Orb, a Pokémon holding a Mega Stone or an Orb that enables it to Mega Evolve or undergo Primal Reversion, a Pokémon with Multitype holding a Plate, or Genesect holding a Drive — this move will not receive the boost.
-Bulbapedia

Mega stones are items that cannot be knocked off.

Answer 3

No.
That would be stupid and won't happen.

Source- Other questions and experience