Serperior has little room for variation due to its limiting movepool, so a moveset will almost always look something like this:So I have Snivy with Hidden Power Rock, what is a good offensive moveset and EVs. It has a Timid Nature.
Serperior @ Life Orb
EVs: 252 SpA / 4 SpD / 252 Spe
- Leaf Storm
- Dragon Pulse
- Hidden Power [Fire/Rock/Ground]
- Giga Drain/Knock Off
Obviously HP Rock in your case, and typically people run Giga Drain to give it a secondary STAB option that also recovers Life Orb recoil. I also prefer Giga Drain, though Knock Off does have some utility though since switching in a Heatran/Golbat/Moltres/etc on Serperior are obvious switch-ins and removing an item is always useful. Substitute is also an option in the last slot but you'd have to run something other than Life Orb because that self-inflicted damage adds up fast. Not running Life Orb results in a significant power drop though.