>>56721122She's actually not. There's a sidequest in USUM where you gather up a bunch of really old people, from Hala's generation.
Among them is a beauty, whom is described as a beautiful young woman.
However she reveals she's actually their age if not slightly older, and her good looks come down to getting stung by a mareanie. On purpose. People know pokemon toxins both hurt like a bitch but keep you young. She was said she was probably gonna get a new husband too, which would be her third or fourth if I recall correctly.
So no, any woman you see in pokemon could be any damn age.