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>Only 2 abilities after six generations
What ability would you give it?
I also think Sand Veil could be replaced, because it definitely seems more filler than fitting.
Going purely from a flavor angle:
>It has sharp, hard tusks and a rugged hide. Its Tackle is strong enough to knock down a house.
Rough Skin seems like a good fit, a lot of the dex entries refer to its hide as "rugged" and "tough." Speaking of tough...
>A Donphan is so strong it can easily haul a dump truck. Its hide has toughened to a rock-hard state. An ordinary sort of attack won't even leave a scratch.
I think something like Solid Rock or maybe Rock Head would fit this. Although one could argue that Sturdy already covers this aspect.
>Donphan's favorite attack is curling its body into a ball, then charging at its foe while rolling at high speed. Once it starts rolling, this Pokémon can't stop very easily.
You can take two things from this: high speed or incredible momentum. High speed might suggest Speed Boost. Momentum might suggest Stalwart. Steadfast could depict both.