So after thinking about it for a while I've come to a pretty woke conclusion: Lysandre is the only decent character in all of XY
		
		
	 
XY didn't really have that many stand out characters for most of the main game. But I wouldn't say Lysandre was the only decent character.
For the main game, I still defend 
Shauna had a nice subtle growth of character. She starts out as a bubbly girl, but your first moment alone with her in Parfum Palace reveals some hidden depths and her goal for the journey isn't just to explore Kalos but form memories of fun times with her friends. That doesn't sound like much, which later she herself then questions when momentarily letting go of her perky attitude to talk to the player about why they're travelling and her insecurity she's just goofing around while everyone else has a more simple goal, though then tries to play if off she was joking around. She was also of all the Rivals the biggest help, even a bit more than Calem/Serena, having a device from Clemont which opened the door to the Ultimate Weapon's core and distracted some Admins by running away making them chase her (and since she comes back I can only assume that means she defeated them off screen). She then is one of the few if many only character to call out Lysandre's hypocrisy, causing his final breakdown of destroying the Ultimate Weapon and everything inside by firing upon itself. Finally, just before facing the Pokemon League, you have a final battle with all the "side" Rivals which reveals she has a GOODRA (an underleveled one though only by 1 level, infact I don't know what it wasn't Level 50 as her Starter was Level 51) and thanks the player for helping her create wonderful memories with her friends.
In addition to that she had a few funny moments, she's quick to call out and snark when something is BS (being charged to enter Parfum Palace, at the end of the fireworks display how it was for the owner's Furfrou and how she feels sorry for the Furfrou, & charged after hearing the story at the Scary House). She's also the only Rival to trade you a basic stage of their Starter (hey, Calem/Serena, why not YOU breed your Starter so I can have one too! I'll be kind, I'd breed my Starter to get its Basic Stage, what I did for Shauna even though I know it doesn't really matter what Pokemon she got). Shauna mentions she does want to go out and explore other regions one day, so maybe we'll see her again in the future (though judging how Dexio & Sina have aged she'd also be an adult now).
As for post game, the reward for decent character (heck, I'd go up and above decent) would be 
Emma in addition with 
Looker and even 
Xerosic. The father-daughter dynamic that eventually forms between Looker & Emma was sweet, we learn that Looker has had a rough time since Sinnoh & maybe even Unova, and Xerosic gets a surprising amount of development as he too forms an estranged father-daughter relationship and in the end turns himself in and gives Emma his greatest invention so she could live a better life. And all throughout Emma is sweet & kind, concerned she's being a burden to Looker so goes out to find a job which turns out being for Xerosic, and through her pure innocence turns Xerosic around. Like, sure, it's not winning any rewards for best storytelling or drama, but the XY postgame episode's story was leaps and bounds above what XY main game actually gave us and it's success has led them to including post game episdoes in all future games: Delta Episode in ORAS, Ultra Beast Hunt in SM, Episode RR in USUM, and the Royal Twins in SwSh. All which introduce new characters or bring back old ones in a different light, though for my money I don't think they've yet to really top XY's post game story or Emma's character.