I'm thinking of creating a customized pokemon chess set using pieces that I'm gonna purchase off the internet, but I'll need some help deciding which pokemon should represent each respective piece (pawns, knights, etc.)

Here's what I'm looking for in a set

1. It can contain pokemon from any generation

2. I do not want replicas in my set, each piece should be a different pokemon

3. I'd like to avoid using pokemon from the same family if possible (for example, if I have a Squirtle, I do not want a wartortle or blastoise, even if they're on opposite sides)

4. The two kings should be opposite elements, fire vs. water for example

5. I need a combined total of 34 pieces, since I'm considering pawn promotion here

If you wanna help me out, I need to know which pokemon you suggest, along with which chess piece they'd represent, base it on stats please, not on how much you like the pokemon, suggest as many or as few as you would like, thanks! =)