So I am at work right now but when i get home i will be downloading the event mew and i am wondering if there is any way to get the nature you want or are you stuck with the nature you download it with. Is there is any way to save before getting it from the deliveryman without losing it forever?
Just save in front of the deliveryman and talk to him. Reset if it is not the preferred nature.
3DS FC: Snail 4527-8592-7979