Rayquaza in Pokémon Legends Z-A

I decided to say something about Pokémon Legends Z-A and Pokémon Horizons, as I noticed that Lucius' Shiny Rayquaza Aura has an aura that resembles mega evolution, Does this indicate the presence of Rayquaza in Pokémon Legends Z-A, and could one of Lucius' Pokémon be one from Kalos? Anyway, many mysteries for part 3 of Pokémon Horizons, I can't wait for part 3 of Pokémon Horizons to come and understand more about the mystery of the ancestral adventurer Lucius, the only Pokémon he has are Rayquaza Shiny and Arboliva, But I can't wait to discover the next one.

UA warning first of all, always when talking about Pokémon Horizons, without sharing spoilers for the episodes that came out in Japan, and if you do share, always put a Spoiler Alert, but if you're going to talk about the episodes that came out on Netflix, that's fine, but even so, avoid sharing spoilers