Mewtwo

Mewtwo is a Psychic-type Legendary Pokémon from the Kanto region. It doesn't evolve from or into any other Pokémon. It was the first to be available for capture when defeated as a Raid Boss during an EX Raid Battle.

Trivia

 * As a tier Raid Boss, Mewtwo's CP was 60,540. Its maximum capture CP in Bonus Challenge was 2,275 and 2,844 when encountered Pokémon was boosted by weather.
 * When Mewtwo was available in EX Raid Battle, its Raid CP was 49,430 and had a capture rate of 6%.
 * On August, 2017, one day before the Pokémon GO Stadium event, a shiny variant was added to the game files, along with stat changes.
 * Mewtwo was confirmed as a Raid Boss the following day.
 * Trainers who defeated a Mewtwo Raid Boss at Pokémon GO Stadium received over 50 Premier Balls and an increased capture rate.
 * Mewtwo appeared as Raid Boss also in Pokémon GO Park event.
 * On September 20, 2018, Mewtwo became available from Raid Battles until October 23, 2018 as a part of the Ultra Bonus Event.
 * Mewtwo captured during this period gave 5 candies instead of 3.
 * CP of Mewtwo with perfect IVs at level 40 is 4,178, that makes it the highest maximum CP Pokémon from Kanto region.
 * Mewtwo also has the highest Attack statistic in the Kanto region.
 * Mewtwo was able to learn Hyper Beam and Shadow Ball prior to September 20 at 1 p.m. PDT.
 * As of September 20, 2018, Mewtwo is no longer be available from EX Raid Battles and has been replaced with Deoxys.