This is how to get a mystery gift:
Go to the Jubilife TV station in Jubilife City.
Go to the 3rd floor.
Talk to the man in the lower room (he’s on the left).
The first two words you tell him are ''everyone'' and ''happy''.
the second two words are ''wi-Fi'' and ''Connection''. This will then unlock the Mystery Gift feature on the main menu.
When you go into it you can recieve your gift 3 ways:
Wi-fi (kinda) -- while you won't get a gift from this cheat, just get the option to receive it, but when pokemon announces when the mystery event will be, go receive wifi and if you are lucky, you might receive a mystery gift/ legendary pokemon/ wicked sweet area/ ticket/ member pass.