I think it probably would be grapploct vs mega lucario
And then g-max pikachu vs g-max machamp since pickachu also is seen to be battling
We can see mega lucario vs machamp it's possibilty
sobble would had a development arc under ash growing from a weak crybaby pokemon to a strong independent pokemon since ash has battle so its oivious sobble would had that arc if ash caught it so ash could have used it im battle but none of them apply he don't really need sobble he just need its...
I think its been a long time since ash got a shiny pokemon. He should get his own shiny gardevoir and mega it alongside potential mega lucario and non shiny mega gengar
I don't get why people are saying rinto as a rival.
I don't ash will get any rivals aside from bea and maybe marnie/hop
Considering his amount of focus in this series its hard for me to belive it