In the TR thread they are discussing about a possible tournament. I think that it belongs here.
I think that:
.It won't be in Unova.
-There will be a tournament where Ash's older pokemon will participate: a PWT Cup with 4 3vs3. Expect only Ash's battles and perhaps one battle between important characters. I see Brock here.
-And a Pokemon Contest where Ash, Iris and Cilan (for the moment*) will take part. Yes, Contests in Best Wishes. And I think that Ash will use Oshawott here.
EDIT: I notice that only Cilan's rivalry with Burgundy and Iris' rivalry with Georgia and their ending are the only things that need a resolution now. Bianca could appear after Episode N in Juniper's lab before they leave, the rest of the rivals are closed and the only two remaining need episodes to close them.
But Burgundy is a joke rival to start with. Georgia need closure but it doesn't have to be with Ash in it.
With this, I think that:
-Ash, Iris and Cilan will go to Kanto and take part where Ash wants to do here.
-In the 4th last episode of Best Wishes, iris and Cilan leave. If Cilan stay, it would be the 3rd last.
-There will be special Best Wishes episodes about Iris and Cilan after this.
-The last episode will be an introduction to Ash to the new region.
I think that thre will be a Axew evolution, A Scraggy evolution (both at the end), a capture 6th-gen related (could be a 6th gen pokemon, interesting to see who catch it because that will start to answer the 6th gen cast) and if, Palpitoad appears, A Palpitoad evolution. Nothing more.