They dip their big claw in the water and drink the drops on the claw, they do that over and over again until they are full.
u can find the razor claw on route thirteen in white
You can get TM02 Dragon claw in victory road
Hermit crabs dip their big claw in and drink drop of water on it.
about 6 inches
you get it from the claw in the trading party or you trade for it
At the giant chasm
Haxorus, Druddigon,etc.
you need a razor claw, and give it to him/her at night! :)
You don't. Your Pokemon has to level up to learn it.
White apes in the first levels I think
Sneasel will evolve during the night if holding a Razor Claw.