Some ppl have the insight of a Magikarp
Why doing effort if you also can be lazy? Should be the writers motto.I disagree with it being difficult to bring them back.
Like I said above, Dawn literally has her Quilava on hand with her. She can call it out at anytime
Ash is currently living in Kanto. He not that far away from Pallet Town, he has easy access to Professor Oak
He can also get in touch with Kukui quite easily
The problem is the writer's not wanting to bring them back