You know, from an objective standpoint the Pokecenters from Black & White and Pokemon X & Y are the best in terms of in-setting user-friendliness even if I hate the design of XY's Center (too "modern").
There's plenty of seats for weary travelers and people waiting in the center for whatever reason. B&W has what look like a big ol' stack of pamphlets for tourists to look over. There's the Wondertrade and everything at the upper floor, the Pokemart is to the right.
With X&Y you have even more seating on both sides of the building. There's a whole wall of books that could be on anything or be a public library donation thing. Pokemart in the back with a full image display of their goods - presumably this is to show off whatever's on sale or a limited time item. In the back to the left is a dressing room which even setting aside the whole character customization is actually a really good thing in-universe as you have no idea who might've gotten hit by a stray attack or got caught up in an avalanche or something. An area where you can change clothes and maybe clean off a bit is a great idea!
Now we can assume all day long that there's a public access bathroom in any of the Pokecenters, especially in the ones that outright sell drinks beyond the marts (I'm looking at you Sun Moon and Sword Shield), but past XY it looks like they're just doing away with seating. Especially in the case of Scarlet Violet where it's a full on drive-in setup. I'm sure there's all kinds of reasons but I'd love to see more seating and character conveniences.
I never expected it would be this hard to describe a Pokécenter to someone. The idea of an entire building dedicated to Pokémon healthcare is a really strange concept in Hisui, although some people admitted they liked it.
Since 2007, the pokecenter stores have had birthday pokemon they can give you. If you receive one, it'll know the move celebrate which is event-only. More importantly, it gets a birthday ribbon! Only these pokecenter pokemon can have them. Currently as of june 2023, the birthday pokemon is a Flabébé
Just got back from the pokecenter as per @frostbite-yinny 's tips and we found put it is in fact Felicity(my furfrou)'s egg and it is thankfully healthy!
Still trying to figure out who the dad is but until then here's a pic of the egg in an incubator
Bought myself the Heal Ball replica by The Wand Company for my birthday! 🎂 It’s stunning, and the quality is truly excellent. It really adds a lovely touch to my space! ✨💕