Evolution wise, Gamagaru has the highest chance of evolving and the writers can evolve Chaobu if they want. I don't want him to evolve because no need for another three-stage Fire-type, but I won't hate it if he does evolve. Don't know about Gantle, he's getting a lot of focus leading to me believing he'll get some type of electric-wave/trade evolution. Wanting Tsutarja to evolve seems like wishful thinking and I can't see Zuruggu evolving either so evolution wise it looks like:
Zuruggu:15%(His evolution is in relation to Kibago's.....)
I also am gonna be wild here and say Satoshi is taking Zuruggu with him to the XY region or possibly Gamagaru given it was featured in a statue and it might have a split evolution.