Is this for Gen 9? In that case...
"Haha hey <player!> I was hoping you'd show up! Want to have a battle?"
"Alright! Don't think I'm going to go easy on you?"
https://www.youtube.com/watch?v=cODyeNipjzg>Starter weak to player's (2 levels above champion's highest. All other team members are equal. No held item obviously)>Regional bird>Random normal type you can catch early in the game>Second stage pseudo (don't want to overwhelm the player!)Only four Pokemon, the kids might get bored and play on their phones if we don't keep things simple and quick! Also I'd be sure to praise them if they hit the attack button without tripping on their own shoelace and dropping the switch controller.