There is literally no reason to not run Contrary Leafstorm on any set. SD is just horribly outclassed by other attackers in the tier.
Underwhelming (Serperior) @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Leaf Storm
- Hidden Power [Fire]
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Gastro Acid / Giga Drain / Dragon Pulse
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Dragon Tail
So Serperior is going to be forcing a lot of switches into things to try and check / wall it. Dragon Tail is used in combination with Spike stacking to wrack up damage to the point where Serperior can use Gastro Acid on the switch and then KO Bouff with Leaf Storm and proceed to sweep. Dragon Tail can also be used with Giga Drain and Dragon Pulse to wear down switch-ins like Specially Defensive Registeel to the point where HP Fire will KO them.
A nice customizable mon, should see a lot of unique sets.