Gen 1: Bulbasaur - Grass
Gen 2: Cyndaquil - Fire
Gen 3: Torchic - Fire
Gen 4: Turtwig - Grass
Gen 5: Oshawott - Water
Gen 6: Froakie - Water
So I've chosen two of each type in the first 6 gens, the next gen will break that.
At the moment Grass is leading but I'll wait until I see their final...