The world used to be normal. But, a weird merge happened during the time, bringing Pokémon into the real world. But, all of the pokémon turned into anthropomorphic creatures! The world is pretty similar to how it used to be, but it can be a bit...unusual at sometimes.

Now back on track.

You heard a knock on your door, you open it, and it was your Gym friend

"Hello, do you want to exercise? I've got nothing to do, so...do you mind?"