Pokemon is a game full of diverse and crazy creatures of all kinds. What I'm trying to say is that they shouldnt just focus on the visual aspects, but also appeal to the other senses.
Gamefreak needs to get Nintendo to make a special 3DS or next system which has new components, such as a temperature changer, a sprayer, and a taste device. I feel as though it will add to the intensity of each Pokemon, adding to the experience.
For example, if a trainer sends out their Charizard, I want my 3DS to get so hot that I cant even hold it anymore. It should apply to pretty much any Pokemon and whatever type they are if it is applicable. My 3DS should freeze up upon the summoning of an Articuno, or a fist should pop out the bottom of the 3DS and punch me in the stomach when a Hitmonchan is called upon.
As far as other possibilities, it can appeal to other senses. I need my 3DS to fart in my face whenever a Koffing or Skuntank are sent out. Its vital that if I lick my 3DS and there is a Muk on the field, I get poisoned in real life and get close to dying. How has Nintendo not made it so that when there is a flying type like Pidgeot or Swellow on the field, that your 3DS gets covered in bird ****? These are such obvious mechanics to put in the game.
Someone should bring these ideas to Nintendo/Gamefreak.