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I haven't played Showdown in awhile, but here's what I used back when I played in the 1300-1499 range of OU.
Hippowdon (M) @ Smooth Rock
Ability: Sand Stream
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Stealth Rock
- Slack Off
- Whirlwind
- Earthquake
Excadrill (M) @ Air Balloon
Ability: Sand Rush
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Earthquake
- Rapid Spin
- Iron Head
- Rock Slide
Garchomp (F) @ Garchompite
Ability: Rough Skin
EVs: 252 Atk / 4 SpA / 252 Spe
Jolly Nature
- Outrage
- Earthquake
- Stone Edge
- Fire Blast
Tyranitar (F) @ Weakness Policy
Ability: Sand Stream
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Crunch
- Stone Edge
- Dragon Dance
- Ice Punch
Stoutland (M) @ Choice Band
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Return
- Wild Charge
- Superpower
- Pursuit
Gastrodon (F) @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Scald
- Recover
- Protect
- Yawn
I like playing weather teams, and I was pretty much the only one to enjoy 5th gen's meta.