2 quick questions

[Elecious]

1) I am going to train up a Hariyama and have already bred Cross Chop onto him, i was wondering if it was worth keeping the move Belly Drum to increase his massive attack even higher or does the loss of life mean its more of a disadvanatge in battle rather than an advantage?

2)I have been looking at Dusclops defence and special defence and they seem pretty high, is it worth training him/her up to be the tank of my team or is there another pokemon with a higher defence and special defence that i could use?

[Blue Kirin]

I think Belly Drum is too risky. Try Bulk Up better.
As far as using Dusclops as a tank, nah. He's a better annoyer.