Its that time again, making predictions. I made the gen 5 predictions a while ago and kept them in my back pocket, so seeing them again I can say... wow finding pairings was hard, but I shall try anyways. (Note: I make the assumption that the Forces of Nature are paired though that might have been confirmed in a previous comment there is too many to scan through)
Part 1:
Cobalion and Caitlin: Seems like an odd pairing but in BW2, Cobalion is said to be found on route 13, right next Undella Town where Caitlin lives. Perhaps this princess saw this Pokemon of legend strolling outside of town and now demands we fetch it for her. After this of course we can (Insert my large Undella Town side scene rant here).
Terrakion and Shauntal: Another strange pairing but Shauntal being a writer on other trainers, perhaps she simply issues this as a challenge in order to document our tale of poke breeding.
Virizion and Elesa: I know it seems like it would make sense for Elesa to get Thundurus, but because they're getting grouped there is a better candidate. Virizion isn't close to Elesa location wise either, this is purely a vibes choise. Elesa being a supermodel and Virizion giving off more feminine vibes then the other swords, perhaps it is Elesa feeling her grace being challenged by Virizion. This is like the Cheryl pairing last time, mainly vibes.
Forces of Nature (+ Enamorus) and Skyla: yeah you need 4 pokemon (in 2 segments) to get Skyla but... flying types and flying type trainer simple as. Also Skyla thicc af so honestly seems worth the effort.
Victini and Hilda/Rosa: One of the two female PCs want to see the victory pokemon. Issue is I can't say which one wants Victini since they are PC's and similar in character design honestly. Still this just makes a lot of sense overall.
Keldeo and Hilda/Rosa: This one doesn't really have explanation other than pairing is needed and PC seems important enough to get mythical.
Maybe Part 2 (these Pokémon could be in part 1 but having them in part 2 will be more of a balance of amount of content added)
Meloetta and Roxie: MUSIC, Im pretty sure someone left a comment pitching this which got a thumbs up from Chainsaw so let the obvious connection be obvious.
Genesect and Lenora: Lenora is a museum curator, Genesect is a Pokemon revived from ancient times and forcibly made into a machine because of a spiteful scientist. I think it makes sense for the curator of a museum to want to see such a pokemon.
Part 2 for sures (will be in part 2 and not part 1)
Reshiram/Zekrom and Bianca/Iris: I will expand on this thought in the next pair.
Kyurem and Juniper: So Juniper is the first female scientist we bump into on this journey, a friend of Maple most likely. I think that she wants us to capture Kyurem so she can do some studying of Kyurem, which we would need Reshiram and Zekrom for. Bianca is Junipers research assistant, likely rewarding us for find either one of both, Iris being the champion (I assume we in BW2) and a dragon type trainer would also like to see these two legendary dragons. So perhaps Bianca and Iris have the same requirement of getting Reshiram AND Zekrom, but both have different motives, one for research and the other out of curiosity.
Those are my predictions for Unova, Chainsaw is free to copy any of these ideas if needed and im excited to see what comes next.