It can be Ash? Well, if that's the case, then Ash is number one! He believes in friendship with the Pok?mon he encounters and doesn't believe too strongly in evolving them. Even if his Pok?mon are not evolved (most notibly Pikachu), they manage to get the job done. He does have a few evolved Pok?mon, but they evolved out of love.
If not, then it would have to be either Gary or Ritchie. They're just like Ash! The only exception is that Gary seems to have fully evolved Pok?mon. Even his Eevee evolved into an Umbreon, so I guess he wants them to evolve to get stonger, faster. Boy, did Ash prove him wrong!