What if for future PokƩmon games, there was a mechanic where you can find/acquire a kind of evolution/mega stone hybrid that can permanently evolve the PokƩmon that usually require trading to evolve.
Along with making trading evolutions obsolete, or giving players another way to make such PokƩmon evolve (though a lot of people do hate that mechanic now), apparently mega stones haven't appeared in the more recent games, so this could be a way to bring them back in some form.
















