I dont believe you can get a horsea in Pokemon Arcoiris but you can get its evolutions evolution,Kingdra on the first route
you have to fined a wild horsea in route 226 with a good rod the horsea will hold the item the chance is only 5% hope this helps
In Route 12 and 13.
You can get a Horsea in Pokemon Silver by finding it at the Whirl Islands.
Horsea evolves at level 32
HOW GET A HORSEA ON POKEMONINDIGO.COM
I think that you can't get a Horsea in Pokemon Diamond or Pearl unless you trade it in using Pal Park.
Route 226 with the Good Rod.
You can find Horsea at Vermillion City or Routes 10-13
I dont believe you can get a horsea in Pokemon Arcoiris but you can get its evolutions evolution,Kingdra on the first route
it depends on the system
catch a horsea evolve it into seadra give it a dragon scale and trade it
you have to fined a wild horsea in route 226 with a good rod the horsea will hold the item the chance is only 5% hope this helps
Use a good rod where you can find horsea use your pokedex if you seen one already.
in whirl islands you have to have surf
In Route 12 and 13.
Nobody knows lol.