Brendan/May -R/S/E, which I like for no other reason than to an impressionable 13/14 year old at the time it felt real. It just seemed logical that the Professor's son and the Guym leader's daughter should secretly have a crush on each other.
Hilda/Cheren - B/W, which is an odd one because it didn't really occur to me originally when I played the game. I figured that, because there were at least three characters running around, Cheren and Bianca were more likely to be 'the ones'. But I don't know anymore. I suppose I feel differently because from the gameplay it seems clear that while Hilda/Bianca are close because they are girls together, Hilda/Cheren are close because they are like-minded as trainers - if not Hilda is a bit more calm and relaxed with her Pokemon.
Hilbert/Bianca - B/W, which I came to after I decided that Cheren wasn't going to work. I've never played the game through a boy POV since I had too i.e. Crystal, but I know a lot of people like this and, I guess, putting the girl rival with the boy hero, and the boy rival with the girl hero makes sense really lol. I feel that if you play the Bianca scenes of doubt as Hilbert, her frankness with him is endearing.
Hilda/N - B/W, so shoot me. Speaking for myself I HATE the way a lot of fans portray this because more often than not N is out-of-character and Hilda is nothing like you get the feeling she should be. Yet in my own head I like it, and that's because it is so impossible. It's rather one of those ships where the individuals never realise how much they shared with the other until they're gone. Plus, it's the whole dualism thing they have going. Male/Female, Zekrom/Reshiram (Yes, Black is my head canon), Ideals/Truth. Not a cutsie romantic love but a much deeper bond, like being in love.