Niantic revealed in one post the criteria to be invited to the exclusive raid to capture the legendary Pokémon Mewtwo.
Players will only receive the invitation if they have participated at least one Raid EX, who are more likely to appear in sponsored gyms.
Have one medal of very high level in a gym or have completed many raids it will increase the chance of receiving the Raid invitation to capture Mewtwo.
Mewtwo had been released a few months ago Japan, and the news today follows the long-awaited addition of the first wave of Pokémon of third generation. The release of new monsters directly from Hoenn is expected for next month, while for the moment is still open challenge to capture 3 billions of Pokémon and earn rich rewards.