What water type pokemon should i use in pokemon white?

Lapras is a great choice for both an offensive and defensive water type. It's a tank with amazing defense and both ice and water type moves. That Electric type trying to take your Lappy out? Bulldoze, if you manage to pump up its speed. That gr type? Ice Beam. That Fighting type? Psychic. Rock? Hydro Pump or Ice Beam once again. A great Pokemon, for sure.