I personally never liked the rival system of XY. Yes, we're supposed to be a group of friends traveling together on our journey around Kalos but they took the "rivalry" aspect almost entirely. The encounters you have with them are frequent and annoying; you are challenged by Shauna, Tierno, and Trevor to battles but they hardly pose any sort of threat and the wins were not even satisfying. What happened to the snobs like Blue, the deep, damaged rivals like Silver, or the wishful thinkers like N? Today we just hear about Tierno's love of dancing before AND after wiping the floor with him (Oh dear god teach that Roserade something other than Petal Dance you idiot. You're giving my Chesnaught free turns). The closest sign to an actual rivalry is when we challenge Calem/Serena at Kiloude City, he/she becomes disappointed when they lose and vow to become better.
Maybe things will change with ORAS
"Hi! <player>! I bet you're surprised to see me here! I made it all the way here, and it's all thanks to you! <Player>, losing to you that time made me stronger! But I'm not going to lose anymore! I'm going to win! For the Pokémon who gave me courage and strength! Okay… Here I come! "
While crushing the hopes and dreams of some sick kid is a sadistic yet interesting plot device, I just hope Wally is more challenging this time around. Maybe his Roselia and Magneton could evolve before he battles you at Victory Road.