Personally I never thought Pokemon were grounded in reality, despite whatever the original intention was, and that's caused a few autistic tangents from me. They're larger than most animals (One of the smallest Pokemon, Joltik, a literal tick, is the size of a tarantula), but lighter as well (Groudon, one of the heaviest Pokemon, weighs less than an elephant). They're pocket monsters, fine, but they're hardly monsters at all, they were all designed to be giant stuffed animals that you could fit in your pocket.