I also think it makes sense to stick with the team he actually built up. He went through all the training with them (granted, some more than others), bringing them to all the rank climbing, so the idea of dumping them because now this is the real deal time for bringing out Charizard, Infernape, Greninja, Sceptile and I dunno Incineroar does kind of feel off.
I think Journeys would need to be structured more like Battle Fronter where Ash is just constantly using random Pokemon from his reserves all season and not necessarily doing a lot of captures and have the more traditional League structure for the finale where there's a ton of different matches where everyone is using different Pokemon in order to make the "just bring the fanservice mons to the finale" finale work.
I think Journeys would need to be structured more like Battle Fronter where Ash is just constantly using random Pokemon from his reserves all season and not necessarily doing a lot of captures and have the more traditional League structure for the finale where there's a ton of different matches where everyone is using different Pokemon in order to make the "just bring the fanservice mons to the finale" finale work.
