As you know, Gloria and Zacian are the next New Sync Pair. they are the first from Galar but will be Poké Fair locked. This brings the question of who will be next from Galar.
They’re definitely going to lock Rose as a Legendary Event Sync Pair with Eternatus. Hop might come with Zamazenta, Leon can’t have Charizard because SS!Red has it so I think Dragapult will be his Partner Pokémon. The Gym Leaders are easy, Milo and Gossifleur or Appletun, Nessa and Drednaw, Kabu and Centiskorch, Bea and Sirfetch’d, Peony and Copperajah, Alister and Cursola, Opal and Alcremé, Bede and Hattrene, Piers and Obstagoon, Marnie and Morpeko, Gordie and Coalossal, Raihan and Duraludon, Melony and Frosmoth.
Others include Mustard and Urshifu and Viktor and Corviknight