>>41907376They give them exclusive moves but a gen later end up giving them to other mon as egg moves or otherwise. You feel for the Alolan Starters when they lost their exclusive z moves so quickly.
Limiting their bst for in game would be strange, everyone I grew up with had their starter carry their first playthrough as kids anyway. I suppose comparing it to pseudo legendaries, who evolve very late, might be the cause as they always have starters fully evolve around the 30-36 range, so consistently mid game.