The team I made uses entry hazards. Not all Pokemon know entry hazard moves. I currently have the team in Gen 7 Ubers on Showdown. This is the team:
Skarmory @ Leftovers
Ability: Keen Eye
EVs: 252 HP / 232 Def / 24 Spe
Impish Nature
- Stealth Rock
- Spikes
- Roar
- Brave Bird
Qwilfish @ Black Sludge
Ability: Intimidate
EVs: 252 HP / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Toxic Spikes
- Spikes
- Substitute
- Protect
Ariados @ Black Sludge
Ability: Swarm
EVs: 248 HP / 8 Atk / 252 SpD
Careful Nature
- Sticky Web
- Toxic Spikes
- Leech Life
- Substitute
Altaria @ Black Glasses
Ability: Natural Cure
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Perish Song
- Dragon Claw
- Pursuit
- Attract
Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 248 HP / 8 Atk / 252 Def
Impish Nature
- Knock Off
- Stealth Rock
- Toxic
- Leech Seed
Dragonite @ Leftovers
Ability: Multiscale
EVs: 252 HP / 4 Atk / 252 SpD
Careful Nature
- Toxic
- Dragon Rush
- Iron Head
- Roost
Is there anything I need to change? What would be a good tier for the team to be in?