>>20623499Probably pretty difficult.
I wanted to check the numbers on the Pokedex. This is most likely the new Hoenn Pokedex, going off Salamance's new number:
Salamance: Original number: 189. New number: 198. 9 total new Pokemon before him
Pichu: Original number: 155. New number: 162. 7 total new Pokemon before him.
Feebas: Original number: 140. New number: 145. 5 total new Pokemon before him.
EVOLUTIONS SINCE RSE:
Gallade: New Number 32
Probopass: New Number 62
Magnezone: New Number 85
Budew: New Number 97
Roselerade: New Number 99
Dusknoir: New Number 155
Chingling: New Number 157
Rhyperior: New Number 178
Frosslass: New Number 181
(Total: 9)
Total REGIONAL POKEMON: 209 (211 with Jirachi and Deoxys)
If they want to go for a more-even 210, Regigagas, who is usually associated with the Regis, could be thrown in.
GameFreak is leaving the regional dex largely the same, and I don't have my hopes up for post-game availability.