So I've been noticing that in every generation since, the third? There have been NPCs alluding to the fact that Pokemon and humans were once one and the same. I just beat Valerie and she says this,

"I've always wanted to be a Pokémon, you see. That desire is my inspiration and what I try to achieve by designing. And yet...the only time I feel I am truly one with Pokémon is when we are embroiled in desperate battle. I wonder why that is... Hmm... Could it be-- Never mind. It is nothing, kind Trainer..."

Why do I get the feeling that in a generation or two, we will have some form of merging mechanic between trainer and pokemon? Why do you think gamefreak keeps dropping these 'human/Pokémon-same species' idea into the games?