This is what I'm thinking as well, I could see a special Max Raid event for the Isle of Armour that lets you get Own Tempo Rockruff and/or Dusk Lycanroc shortly after launch, but otherwise I can't see it being available in standard gameplay. I'd like it if they change Rockruff's evolution so Midday and Midnight Lycanroc are no longer version exclusive, it made sense for Sun and Moon (because, well, SUN and MOON), but for the Isle of Armour it would be great if you could get both Lycanrocs in one version of the game. On that note, I hope the Expansion Pass doesn't have too many version exclusive Pokemon (obviously most of the Legendaries will be, I'm talking about standard Pokemon), because I'm only really wanting to buy one version.