I want the next game or next gen to have some improvements to moves. Something along the lines of that every pokémon can train on or become specialized in one specific move that it knows - with the downside that it cannot unlearn that move anymore.
That move will then have a slight increase in accuracy, power, or something long those lines. Best case scenario would be that you can even choose one of multiple options per move - either increase accuracy, power, add some minor special effect, or remove/lower a downside of the move, etc.
Something along the lines of a 50% chance that Hyper Beam doesn't let you miss a turn, or Hyper Beam has a 100% accuracy, or Hyper Beam can flinch the opponent, or Hyper Beam becomes 180 power. Something like that would be cool.
At least gamefreak didn'tr adhere to racist stereotypes then. That's a good thing, right?