Since you are considering the champion to be part of the elite four, Wallace was a gym leader and then hoenn champion. I love Iris being the champion in bw2! Her theme is AWESOME! I just got my 6th badge in the game, you should totally play it!
OW man sorry i Forgot about Wallace(facepalm),but koga still fucking awesome.
And Iris being the champion was a surprise to me more than Bell being the professor.
I don’t know about N but i hope they gave a awesome ending for him.
And still think that have/must have a moment when you battle againd Hilbert/Hilda like Red in (Heart)Gold/(Soul)Silver.