We are unsure of how form changing will occur in Pokemon Go, but this article will be updated with information as soon as it is known. Exchange the ticket for a Mewtwo at the recruiting part of the terminal. Yeah, by doing that you basically unlock them, but that's not how you get them. I have been try to get it as well so i feel your pain.
QueenofthePika posted over a year ago. You will likely only get one Shaymin, following the pattern of how they released Mew, and will need to complete a series of special research tasks to obtain it. Land Forme Shaymin in Pokemon Adventures. Land Form Shaymin's user profile. Release Dialga, Palkia, and Giratina to receive a Mewtwo Ticket.