The Pokemon franchise has an incredibly developed lore exploring the history of its in-game universe, exploring its peoples and Pokemon. Few stories are as well-loved and known as that of the Legendary Pokemon Mewtwo, however. Mewtwo is one of the series' most popular Pokemon, originating in Pokemon Red and Blue, starring in multiple Pokemon movies, and even earning a multi-game roster spot in Super Smash Bros. It's no surprise then that Pokemon fans across the world are coming together to celebrate Mewtwo's birthday.