Not 100% sure, but the Goodra pic may be against Tyranitar with sand stream.
The Hawlucha and Goodra pics are from the battle with Alain.
Noivern not sure and Greninja (vs. Sceptile), Pikachu (vs. Aegislash) and Talonflame (vs. Clawitzer) are from the battle with Sawyer/Shota.
EDIT: The Noivern...
Considering Tyranitar is already going to set up with sand stream it is quite possible it will also set up stealth rock. Maybe a poison type with toxic spikes like Paul. Don't think he would do both though.
Looking at this preview at the end it appears that Sceptile will battle Greninja from a fresh start.
Sceptile may have just been able to take down Ash's other Pokémon without any damage or Ash has 1 or 2 in the back that have been recalled.
I'd go with Sawyer, his team is better than Remo's overall and would be able to counter Remo well. Remo would be able to put up a good fight though.
Garchomp -> Sceptile
Bouffalant -> Slaking
Gurdurr -> Slurpuff/Clawitzer
Rhyperior -> Aegislash
Pelipper -> Salamence
Granbull -> Slurpuff/Clawitzer