Blue and Silver never left much of an impression on me, they were just annoying to me as a kid and my friends and I always used to mock them and never took them seriously at all, especially Silver, all this guy did was whine like a toddler. I'm not sure about what some people see in these guys, they were inept as fuck. All they did was talk shit but then they would get destroyed in battles, which only made them look stupid. Shit talking is fine but when you can't back it up with actions it only makes you look a buffoon, which is these two are, fucking buffoons.
GameFreak moved away from this sort of rival for a reason, you can't have a rival smack talking when he/she always loses, all it does is make them the personification of the phrase "Chat shit, get banged", it's dumb and makes him/her look like a joke, its best just to stick to friendly rivals in this sort of series. I quite liked Cheren and Bianca, it was interesting watching them figure out what they wanted to do in life.