>>13330723What's weird about it is that all looks like the same item.
On serebii it says Lucario needs an item called lucarionite and Blaziken blazikenite but also talks about general mega stones. It'd be a bit strange if they all look the same.
Also if it takes a turn to use one of these mega stones it often won't be worth it, Lucario for example gets a boost to attack but can also learn swords dance.