Chansey

Chansey is a extermely-rare Normal-type Pokémon from Kanto region. She evolves into Blissey when fed with 50 candies.

Trivia

 * Her spawn rate was higher during the Valentine's Day event.
 * On August, 2016, her attack Psybeam was replaced with Hyper Beam, which has higher DPS.
 * Her most optimal moveset in combat is Zen Headbutt and Dazzling Gleam.
 * Along with Lapras and Snorlax, Chansey is considered as one of the most effective Gym defenders of Kanto-region Pokémon.
 * Since Generation IV of core series games, Chansey evolves from its Baby Pokémon - Happiny, but in Pokémon GO it's currently not possible.