The thing about Pokemon X and Y (Patreon)

Aside from Serena, Shauna, Tierno and Trevor, do both games offer any other rivals or trainers that can rival or even match Calem in terms of looks or personality? 

Like Red against Green/Blue, or Gold Against Silver, Brendan against Wally and so on...

I'm doing this for future chapters but I can't seem to find one in the game or how much research I put into it. Unless I'm missing something, I would love to hear your thoughts about it.