2 of the best cards in the last set, the fighting belt and max elixir, have came with a specific caveat that they only work on basic pokemon. We've seen something similar in the Black and White era with Eviolite, Prism Energy, and Skyarrow Bridge. In a format where evolutions were already outmatched by big basics, this was just another slap in the face to anyone who wanted to try to make them work. And the worst thing about it was how unnecessary it was. They could have easily made no caveats to those cards and it would still have a similar effect on the game. Most of the Pokemon using those cards would have been basics either way and that's because basics already have the huge advantage of being able to be played instantly. Along with an even bigger advantage of needing less deck space on weak evolving basics that have no chance on their own. Do they really need any more advantages?
It looks like they're down that road again. First with Empoleon in xy8, then the 2 aforementioned cards from xy9, Mew in the upcoming xy10, and a few other cards I'm sure I forgot about. They should fix this either by reprinting cards like Max Elixir to work on all pokemon, making more cards specifically benefiting stage 1 and stage 2s, or at the very least, reprint cards like muscle band that could work on all pokemon before the next rotation. I don't expect this to drastically change the format, but it should at least give non basics a fighting chance.
It looks like they're down that road again. First with Empoleon in xy8, then the 2 aforementioned cards from xy9, Mew in the upcoming xy10, and a few other cards I'm sure I forgot about. They should fix this either by reprinting cards like Max Elixir to work on all pokemon, making more cards specifically benefiting stage 1 and stage 2s, or at the very least, reprint cards like muscle band that could work on all pokemon before the next rotation. I don't expect this to drastically change the format, but it should at least give non basics a fighting chance.