Looking for the best moveset for a empoleon at lvl 100
SubPetaya is probably the most effective moveset.
SubPetaya
Empoleon @ Petaya Berry
Ability: Torrent
EVs: 12 HP/244 Spd/252 SAtk
Modest nature (+SAtk, -Atk)
- Agility
- Substitute
- Surf
- Ice Beam / Grass Knot
Switch in on something like a Choice locked move to force the opponent out, Agility, Sub down until Petaya and Torrent activates, and sweep. EVs allow Empoleon to outrun +1 neutral natured Electivire / Yanmega, Scarf Heatran, etc.
Lead
Empoleon @ Focus Sash / Chople Berry
Ability: Torrent
EVs: 156 HP/100 Spd/252 SAtk
Modest nature (+SAtk, -Atk)
- Hydro Pump / Surf
- Aqua Jet
- Stealth Rock
- Grass Knot / Ice Beam
Hydro Pump + Aqua Jet KOes all the suicide leads; dents Machamp, Metagross, Swampert, and the like; and sets up Stealth Rock. With EVs, Empoleon outspeeds Metagross, Machamp, and Tyranitar.
Specs
Empoleon @ Choice Specs
Ability: Torrent
EVs: 252 HP/4 Spd/252 SAtk
Modest nature (+SAtk, -Atk)
- Surf
- Ice Beam
- Grass Knot
- Sleep Talk / Hidden Power [Electric] / Hydro Pump
Last move is mainly a filler; Sleep Talk helps with sleep inducers, HP Electric OHKOes Gyarados instead of Grass Knot's 2HKO and does more to Vaporeon and Tentacruel, and Hydro Pump is just a more powerful STAB move.
Agility
Empoleon @ Life Orb
Ability: Torrent
EVs: 12 HP/244 Spd/252 SAtk
Modest nature (+SAtk, -Atk)
- Agility
- Surf / Hydro Pump
- Ice Beam
- Grass Knot
Hydro Pump for more power to make up for the Petaya and Torrent loss. Timid nature can be used to outrun Scarf Rotom-A, Heracross, and Porygon-Z after an Agility.
Defensive
Empoleon @ Leftovers
Ability: Torrent
EVs: 252 HP/4 Spd/252 SDef
Calm nature (+SDef, -Atk)
- Surf
- Grass Knot
- Hidden Power [Electric] / Stealth Rock
- Roar / Ice Beam
Never used this myself, but I heard it was ok. You can use 160 Def EVs to survive two +1 Outrages from Life Orb Kingdra.