Let’s say they are seeing Squirtle, Pidgeot and Primeape in Kanto. Larvitar in Johto. Ambipom in Sinnoh. Butterfree at the Decolore Islands and/or Unova after flying away (although I saw a scene in an ending with Ash meeting Butterfree). Lapras at the Orange Islands or Johto. Goodra and Greninja in Kalos. His Alola Pokémon in Alola. And maybe we could see some of TRio’s old Pokémon again. Like Arbok and Weezing in Hoenn, Cacnea in Sinnoh,…Misty’s weird MIA status in JN is made up for here at least, my new question is why go to old regions to see “Pokémon they’ve bonded with” when nearly all of them are with them, Oak’d or Kukui’d
Although maybe I’m already hoping for to much. It is only 11 episodes.