>>55173981>trainers that that specialize in one type of pokemon begin to assimilate characteristics of that type.Sounds like putting the cart before the horse to me. People of certain kinds are just more inclined to train monsters of a specific type. Kids rummaging in the woods catch bugs and become bug catchers, engineers/electricians train electric types, martial artists train fighting types, swimmers are surrounded by water types. In the zany JP pop culture melting pot world that is Pokemon, there's just some people who happen to have psychic powers.