I have only done a few pokemon showdown battles with them but gengar and venusaur are pretty good:
Gengar @ Wide Lens
Ability: Levitate
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature
- Hypnosis
- Dream Eater
- Shadow Ball
- Hex
Venusaur @ Heat Rock
Ability: Chlorophyll
EVs: 252 HP / 4 SAtk / 252 SDef
Modest Nature
- Solar Beam
- Toxic
- Synthesis
- Sunny Day
Tentacruel @ Leftovers
Ability: Liquid Ooze
EVs: 252 HP / 252 SDef / 4 Spd
Calm Nature
- Ice Beam
- Hydro Pump
- Sludge Wave
- Aqua Ring
Metagross @ Leftovers
Ability: Clear Body
Shiny: Yes
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature
- Meteor Mash
- Zen Headbutt
- Stealth Rock
- Earthquake
Garchomp @ Lum Berry
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- Outrage
- Fire Fang
- Earthquake
- Stone Edge
Ninetales @ Leftovers
Ability: Drought
Shiny: Yes
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature
- Flamethrower
- SolarBeam
- Will-O-Wisp
- Calm Mind
