First, you must have a Seadra. You must also have a dragon scale. Attach the dragon scale to the Seadra and trade it (the Seadra must also be a male). It will then evolve into a Kingdra.
Capture a Horsea or Seadra first. (Fish with a good rod on Routes 4, 10, 12, or 13) Once you have a Seadra you need to find a Dragon Scale (Water Path or held by a wild Horsea), Make the Seadra hold it and then trade it to a friend. It will then Evolve into a Kingdra.
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Kingdra does not evolve.
you have to evolve horsie into sedra then evolve sedra into kingdra.
Have your Seadra hold a Dragon Scale, then trade it with a friend. Seadra will then evolve into a Kingdra.
Kingdra is #230 in the national pokedex, and it is a Water-Dragon type Pokemon.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.