You can't get horsea in xd.
Horsea is a Kanto region pokemon.
Use a good rod where you can find horsea use your pokedex if you seen one already.
King's Rock (if held) can occasionally make a pokemon flinch when the user attacks the foe. Certain pokemon will evolve from the item if those pokemon are traded. Horsea however is not one of those pokemon.
Altaria and Shelgon will make Horsea learn dragon breath. This move can also be learned leveling up in the Pokemon games.
Pokemon xd in my opinion
HOW GET A HORSEA ON POKEMONINDIGO.COM
Horsea is a Kanto region pokemon.
you get horsea on route 226
you have to go to pacifidlog town and surf then you'll run into a horsea and that's how you get a horsea.
Horsea transforms into Seadra at Level 32.
You can get a Horsea in Pokemon Silver by finding it at the Whirl Islands.
Horsea evolves at level 32
I dont believe you can get a horsea in Pokemon Arcoiris but you can get its evolutions evolution,Kingdra on the first route
Horsea is the seahorse Pokemon.
Horsea evolves at level 32 into a Seadra.
You can obtain Horsea by fishing on Routes 132, 133, and 134 in Pokemon Ruby.
Horsea evolves into Seadra starting at Level 32.