I'm planning to soft-reset the Enigma Stone event Latios but I got a question, is the nature already chosen when Latios appears in front of the museum or when you battle it? Cause I wanna know if I'll be able to save in front of him without it having a nature picked already. (I know with pokémon like Dialga the nature is picked when encountering but since this pokémon is from an event Idk...) Please could someone give me an answer?