What's a good HM slave in Black and White 2?

Question

White 2 I'm at the start.

Answer 1

Samurott.
It knows Cut, Surf, Waterfall, and Dive.

Comments

And it still hits hard as Waterfall, Surf & Dive are STAB.

Answer 2

Swanna gets Fly, Surf, and Dive which is useful for travelling everywhere.

Answer 3

skarmory is one of the best but you can only get it at reversal mountain