>>45704296>So if megas are simple enough to be used in any media, why don't they just not make new gimmicks like Z Moves or Dynamax.Well, probably because GameFreak don't care about the other media because they'll still get tons of money with a new gimmick every gen, whether it's simple or not, so why not just make it more grand? And also I'm not really sure you can have a simpler gimmick than Mega Evolution.
>Furthermore, why is megashit still appearing even after these two "other gimmicks" have been in rotation?Again, simply because it is easy to use. It's basically just a fourth stage evolution, so the devs of Go, Masters etc put it in.
>I guess what I'm asking is what really defines a gimmick, and what does it take for it not to be a gimmick? That may be the only way to determine if megas are a gimmick or not.It's something new used as a selling point of the game, Megas, Z Moves, Dynamax, even Fairy Type, Customization, Regional Forms etc. It's not inherently a bad thing at all, just a classification of things that were used to attract people to a game.
>What's wrong with the 4th stage of Pokemon evolution just being temporary rather than permanent?Well this is subjective, but I think it is very pointless to give a pokemon a pseudo fourth stage (especially ones who don't need it like Mewtwo and Charizards two forms) instead of just bringing back cross gen evolutions. Not only would it make the pokemon more relevant and stronger without being a temporary fad, it is would also be more creative.