So far, we've had only Bianca who doesn't really count as one because she is a ditz. Then, we have May/Sapphire who isn't really counted as one unless you pick a guy, but even then, she is still not a good rival.
I want a rival who players WANT to defeat in a battle instead of ridicule (Bianca) or isn't much of a rival (Hugh). We've had Blue/Gary, Silver, Barry/Pearl, Cheren, and Hugh. While the female ones aren't really considered as "rivals" and R/S/E rivals are just changeable.
I'm okay with the two or more rival thing as long as there is at least ONE female who is good at battling. There are a lot in the anime/manga.
I just want a rival with some depth to them. We've had a few before but...Hugh in the most recent game is a huge let down. And his backstory had a lot of potential to be that rival you wanna smash yet also feel sorry for.
Instead all we get is "I'M UNLEASHING MY RAGE! >O " and "Help me out pal! Ok, baaaaiii!"