The thing about Donphan is that it can't stop some of the most used Ghost types in the game (i.e. Jellicent, who proceeds to burn you), or just gets downright OHKO'd (Or 2 hit-KO'd, in the case of Sturdy). However, if you really need that Rapid Spin in (in the case of, for example, for a Volcarona), then it might just be worth it. However, I think Hitmontop does it better.
Now, stupid Xevo time! XD
Dragonite @ Chesto Berry
Adamant Nature (+Atk, -Sp. Atk)
Ev's: 4 Def, 252 Atk, 252 Spd
~ Dragon Dance
~ Dragon Claw
~ Fire Punch
~ Rest
You know how annoying it is, when you think you have that Kingdra almost dead and poisoned, with 4 DD's up, and then it Rest's on you? Well, this thing is like, twelve times more annoying, due to its unique ability; Multiscale. Your opponent will most likely try and poison Dragonite, to make sure Multiscale doesn't go through. This set usually gets 2 - 3 DD ups before it has to Rest, and it can almost assuredly take another shot, while being a almost full after you get the boosts. From there... Well, you know what happens from there.