>>12545662At one point in time Pokemon came in contact with unstable DNA from their respective types, developing parts of that type (Grass, rock, water) inside their bodies, or being able to take advantage from their surroundings.
For example, Water-types can use the humidity in the air, concentrate it in one place and shoot it with great pressure using special muscles designed to create the great impact used to fire the water.
>>12545679Ditto copies the DNA of the Pokemon it wants to transform into, the DNA carries a code that tells the cells when and in what quantity to reproduce, when the Ditto goes back to its original form those same cells die so a Ditto cannot stay as one Pokemon for long.
>>12545707The code in Phione's DNA is shorter, so it doesn't actually mutate, but it just shortens.
So Phione is, putting it in simple words, an "inferior" version of Manaphy.
