It is not known to evolve into or from any other Pokémon. It can only be obtained by breeding Manaphy or another Phione with Ditto.
Phione's status as a legendary Pokémon is often disputed, with contradiction occuring even between official sources.
Phione is the result of breeding Manaphy with Ditto. As a result, it is very similar to Manaphy in body structure. It has a tiny body with a red gem on it. Phione has a single rudimentary foot spike and club-like arms. Phione's head is larger than the rest of its body, and extending from its eyes are two small purple circles. It has a flotation sac on its head with a single, ribbon-like antenna on it.
Phione is a genderless species.
Phione going in the drain
Phione's abilities are similar to Manaphy's, but weaker. Phione is unable to use a number of attacks that Manaphy is able to learn, most notably: Tail Glow, Heart Swap, Hyper Beam, or Giga Impact. Phione are supposedly able to create a dew that cures all ailments. Phione also has the ability to melt its body into water and change its body into a more liquid state similar to Vaporeon.
Like Manaphy, Phione always return to the place where they were born.
This Pokémon is very energetic and playful with its fatherly figure Manaphy.
Phione live in warm seas, especially around the Sinnoh region.
Phione's name is likely a combination of the final syllable of Manaphy's name with clione, sea angels. Clione are remarkably popular in Japanese documentaries, especially in Hokkaido, on which Sinnoh is based (this may also explain their appearance in Chocovine Town). Like clione, Phione's name is pronounced in three syllables.