Pokémon Sun and Moon - Anabel in Sun and Moon by Mayuiki

Because she's literally from Emerald. As in the one with the Hoenn that doesn't have Mega Evolution. She wakes up in the newer timeline just like Looker did in ORAS.

And having a character people know rather than somebody new has more impact, especially when you find out they're the same version (unlike, say Emerald Steven and ORAS Steven).