Blissey

Blissey (Japanese: ハピナス Hapinasu) is a -type Pokémon introduced in Generation II. Blissey has the highest stats in HP.

Physiology
Blissey has curly hair on both sides of its head. Their arms are pink with white wings at the end. It has a patch for its egg, like all of the members of its family. Its lower torso is also white with four flaps of fur, giving it an appearance of wearing a dress.

Evolution
Blissey evolves from Chansey when her Happiness is at max.

Anime
In the anime, Jessie met her long time partner before she went to Team Rocket, a Blissey. When Jessie, James, and Meowth were given food by Blissey she was blamed. However, Jessie stood up and said that she stole the food to save Blissey. Nurse Joy used to have a Chansey that evolved into Blissey. All Nurse Joys in Alola use a Blissey.
 * Nurse Joy's Blissey

Trivia
Blissey has the highest amount of HP out of all Pokémon, which is 369.