I am currently playing Pokemon Black 2 and want a nice HM mule to take care of garbage HMs. In my Platinum playthrough, I used the infamous Bibarel which learned all the garbage HMs. But since it is Unova, can anyone recommend a good HM mule other than water types because water type HMs are strong... someone who can know Cut, Strength, Rock Smash etc etc.
I think the best HM mules are Psyduck and either Braviary or Mandibuzz. Braviary and Mandibuzz can both cover cut and fly, and Psyduck covers the other 4 HMs. All of these Pokemon should be obtainable relatively early. source source
The best HM mules for Black 2 are: Watchog and golduck I would simply swap them when either is required. Patrat and psyduck can be found pretty early too. Golduck covers water HMS like waterfall and surf. Watchog learns cut, strength and flash. See the source for more information! Hope I helped! Skip to 17:38