Hoenn's Elite Four is probably the worst Elite Four in the series---
Now I don't mean in terms of difficulty, but like from a design standpoint they kind of suck. First of all, everyone but Sydney uses multiple of the same Pokemon in R/S, and Emerald only fixes this issue with Drake. ORAS goes back and actually makes it worse in terms of repeated Pokemon, though thankfully there's the post-game rematch.
But the biggest issue is...who the FUCK are they? I don't recall any NPCs in RS/Emerald, or ORAS talking about the Elite Four---I think the only bit of lore is that Phoebe is the granddaughter of the folks at Mt. Pyre.
Otherwise? Sidney---he has a rad design in ORAS, but has like no character other than vaguely being a "punk". Glacia? Doesn't even appear outside the Elite Four, and likes ramen. Hopefully one day we see what Region she hails from (pun!) originally since she came to Hoenn, but who knows? Drake? Cool pirate dude that's friends with Briney...
It's so disappointing that ORAS didn't do more with them especially considering all the little bits of lore they added with Professor Cosmos, Wattson, and all the extra stuff they did to make Team Aqua and Team Magma interesting. The Elite Four got the short-end of the stick.
This doesn't include Steven and Wallace though, they're both fairly cool characters.