(Spoiler Alert........?) New Pokémon revealed but not in the game at the moment

I was very curious about one of the Pokémon leaked on the internet, which is a peach Pokémon, that it is a Pokémon that manipulated the Loyal Three, and I wanted to know if it is a Mythical Pokémon or a legendary Pokémon(I had talked about it before, but I made the mistake of not giving a spoiler alert, but that's it, now I've put a spoiler alert in the title, and I'll do that the next time I talk about something from part 2 of the DLC from Pokémon Scarlet/Violet)