Hello. Before you are three teams I've made for competitive pokemon, specifically Gen 3 OU. I've found them quite endearing to use, especially the Shedinja one if you learn how to use it. They're far from perfect so I encourage you to improve them if you can.

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Shedinja Weather Reset

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Leviathan (Kingdra) (F) @ Lum Berry  
Ability: Swift Swim  
EVs: 104 HP / 252 SpA / 152 Spe  
Modest Nature  
IVs: 2 Atk / 30 SpA  
- Rain Dance  
- Hydro Pump  
- Ice Beam  
- Hidden Power [Grass]  

Behemoth (Snorlax) (M) @ Leftovers  
Ability: Immunity  
EVs: 144 HP / 96 Atk / 132 Def / 136 SpD  
Careful Nature  
- Curse  
- Rest  
- Body Slam  
- Shadow Ball  

White Noise (Magneton) @ Magnet  
Ability: Magnet Pull  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 2 Atk / 30 SpA / 30 Spe  
- Thunderbolt  
- Hidden Power [Fire]  
- Toxic  
- Rain Dance  

Back to 0 (Starmie) @ Leftovers  
Ability: Natural Cure  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Hydro Pump  
- Ice Beam  
- Thunderbolt  
- Rapid Spin  

Cow Tools (Dugtrio) (M) @ Choice Band  
Ability: Arena Trap  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Earthquake  
- Hidden Power [Bug]  
- Aerial Ace  
- Sunny Day  

... (Shedinja) @ Lum Berry  
Ability: Wonder Guard  
Shiny: Yes  
EVs: 252 Atk / 252 Spe  
Naughty Nature  
- Shadow Ball  
- Silver Wind  
- Swords Dance  
- Protect  

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Dual-Electric Wakcham Agilipass

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Sweetheart (Jolteon) (F) @ Leftovers  
Ability: Volt Absorb  
EVs: 76 HP / 180 SpA / 252 Spe  
Timid Nature  
IVs: 2 Atk / 30 Def  
- Thunderbolt  
- Hidden Power [Ice]  
- Baton Pass  
- Toxic  

Queen (Zapdos) @ Leftovers  
Ability: Pressure  
EVs: 252 SpA / 120 SpD / 136 Spe  
Modest Nature  
- Thunderbolt  
- Hidden Power [Grass]  
- Agility  
- Baton Pass  

Yellow Bile (Marowak) (F) @ Thick Club  
Ability: Rock Head  
Shiny: Yes  
Happiness: 0  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Swords Dance  
- Bonemerang  
- Rock Slide  
- Focus Punch  

Showstopper (Medicham) (F) @ Liechi Berry  
Ability: Pure Power  
Shiny: Yes  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Substitute  
- Reversal  
- Focus Punch  
- Shadow Ball  

Skarmory (F) @ Leftovers  
Ability: Keen Eye  
EVs: 252 HP / 248 SpD / 8 Spe  
Careful Nature  
IVs: 0 Atk  
- Spikes  
- Roar  
- Taunt  
- Protect  

Swampert (F) @ Leftovers  
Ability: Torrent  
EVs: 248 HP / 216 Def / 44 SpD  
Relaxed Nature  
- Earthquake  
- Ice Beam  
- Hydro Pump  
- Protect  

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Scientist SD Pass Offense

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ANTIAEON (Metagross) @ Lum Berry  
Ability: Clear Body  
Shiny: Yes  
EVs: 168 HP / 252 Atk / 88 Spe  
Adamant Nature  
- Agility  
- Meteor Mash  
- Earthquake  
- Explosion  

ANTISPIKE (Magneton) @ Magnet  
Ability: Magnet Pull  
Shiny: Yes  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 2 Atk / 30 SpA / 30 Spe  
- Thunderbolt  
- Hidden Power [Fire]  
- Toxic  
- Protect  

ANTIDUG (Porygon2) @ Leftovers  
Ability: Trace  
Shiny: Yes  
EVs: 252 HP / 200 Def / 56 SpD  
Bold Nature  
IVs: 0 Atk  
- Recover  
- Ice Beam  
- Thunderbolt  
- Thunder Wave  

LE CIF MAYMAY (Tyranitar) (M) @ Leftovers  
Ability: Sand Stream  
EVs: 248 HP / 252 Atk / 8 SpD  
Adamant Nature  
- Rock Slide  
- Earthquake  
- Hidden Power [Bug]  
- Focus Punch  

HE'S ROIDING OUT (M) @ Liechi Berry  
Ability: Rock Head  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Rock Slide  
- Double-Edge  
- Earthquake  
- Substitute  

The Syringe (Celebi) @ Leftovers  
Ability: Natural Cure  
EVs: 244 HP / 124 Def / 140 Spe  
Impish Nature  
IVs: 0 Atk  
- Swords Dance  
- Baton Pass  
- Leech Seed  
- Recover