I envision Farfetch'd getting a Fighting/Grass or Water/Grass-type variant, which could give it the long overdue evolution it deserved, as demonstrated with Linoone.
I imagine Farfetch'd evolving into a beautiful, yet badass samurai swan that fights off various predators on land or water. The evolution, regardless of type combo, could learn Sacred Sword for great coverage, in tandem with better Speed or bulk. If they can give a levitating Pokémon a regional variant, they can do so for a Flying-type that is often on the ground.
Dunsparce would also be another perfect candidate to get a Dragon-type variant and evolution, since the only known Dragon-types in Johto are Kingdra and the Dratini line, the latter of which, are technically from Kanto. Mega Ampharos is a temporary transformation and Megas are omitted this time around.
I would personally prefer Normal/Flying or Fairy/Ground, given it's wide movepool and mythical inspiration, but I'm just as happy for another Dragon-type in Johto's type chart. Since Johto is literally connected to Kanto, it can give the classic generations another powerful Dragon-type.
Dunsparce could evolve into a majestic serpent similar to Rayquaza, but with feathers and better Abilities like Intimidate, Sheer Force or even Pixilate.