If you want to you can choose oshawott as a starter and a water Pokemon but if you have a different starter you can catch a tympole in the outer pinwheel forest outside nacrene city
go to the water and if your lucky with a water bubble you can catch it
go fishing mate :)
In Pokemon Black & White or any other Pokemon, you can catch water type Pokemon in the sea or by using a fishing rod.
You can catch it in the Giant Chasm, where you can also catch Kyunrem in a hole with water in it. (*Interaction*)
just catch a tympole or basculin or duklett or frillish in wild which are water type
you can catch water Pokemon by surfing on water and by using all the rods
Go to route 4 and fish by the water, and you should eventually catch one
In Pokemon Leaf Green, you can catch Pokemon in the grass, water, or in a cave.
In Undella Bay or Undella Town, you'll need to surf in rippling water.
wingull is a water/flying Pokemon and you can get them at the start of the game in the first areas you can catch Pokemon in.
You can.
Surf on almost any body of water, and you'll almost certainly encounter one.