I could play a character who hates both humans and Pokemon... well to a certain degree.
It could be this way:
Tron is a guy that always got laughed at for not having a Pokemon... AND THEN BAM! He got a Pokemon from a group of friends (all four of them).
It was a Growlithe... except, the little ungrateful [tornado fang] bit him in the hand and then escaped.
So Tron decided he's not going to have a Pokemon. But living in a world where EVERYONE WHO MATTERS has a Pokemon, is hard. If you don't have one that is.
So he became a spiteful [dark hold] who deep down really wishes he could have a Pokemon friend, but in the end, he refuses to accep another into his "Heart".
......
And now that I've seen the comment about Team Flora being druggies... welp, I'll rather stay away from them.
If anything, I could always throw a different version of Sala in here, and create a duo of "A guy who hates Pokemon and a Girl who Loves Pokemon to the Point of creepy Obsession."
Sala would be like a Poke-Maniac, except instead of wanting to do battle with Pokemon, she would rather just hug them all day. Hence, all Pokemon run away from her.
Or something like that.