You were at home, trying to enjoy being alone, when you suddenly got a knock at your door. When you got up and answered it, you saw a figure walking away from your home, before it turned into a sprint as they seemingly realized you saw them.
When you tried to step outside to see what was happening, your foot suddenly collided with a spherical object on the ground, which was a Poké Ball with a tapped note attached to it, and some money attached to it.
Picking up the ball, you realized it had about 1000 in Poké Dollars. The note had a weird message on it that had hastily drawn hand writing.
"I can't take care of a Pokémon like this anymore. It keeps gaining weight, I don't know why. Nobody wants it. I'm sorry for whomever I left this for. Don't feed it too much.