Maybe you'll get you're starter like how Wally did in RSE. You know, borrow a Pokemon(Zigzagoon for Wally), get a Pokeball (Maybe a few, just in case, then you return it later on), and get followed by some random trainer(You followed Wally, to teach him how to throw a ball)... Shake, shake, shake... Ding! You got your first Pokemon. However... since the starters are already announced, if they were to do that, only the starters would attack, and afterwards, on the first route, the starters will rarely appear on he first route.