>>30053728Everstone passes down nature.
It also passes down regional variants. If you breed an Alolan Meowth holding an Everstone, it hatches an Alolan Meowth. If you breed a common Meowth, the egg will hatch as a common Meowth.
Injectors and other cheaters have been testing the form variants, since thats the only way to obtain old forms right now. Breeding a common form without the Everstone will hatch an Alolan.