Are all of the unobtainable Mega Evolutions items in the anime in some way?

Question

https://m.bulbapedia.bulbagarden.net/wiki/List_of_unobtainable_items#Mega_Charm

There are several, about ten. I remember seeing a few of these in the Kalos anime at some point. Every Pokemon that could Mega Evolve held it's Mega stone in a different way. Are all of these different Mega Pendants and so forth in the anime, or only some of them?

Answer 1

https://m.bulbapedia.bulbagarden.net/wiki/Key_Stone

Here is a resource that shows all of the appearances of keystones in all Pokémon mediums.

There are a few that don't seem to have a parallel, but the stickpin, charm, glove, ring, tiara and what seems to be the pendant show up.

Comments

Looks like some others show up in the Manga, too.