This is my first competitive team. I couldn't try it very much so I need suggestions.
Infernape @ Focus Sash
EVs: 48 Atk / 208 Spd / 252 SAtk
Naive Nature
Ability: Blaze
-Close Combat
-Fire Blast
-Fake Out
-Stealth Rock
I think this is one of the best to start with. He can defeat in a short time Bronzong or he can set stealth rock to take advantage then in the battle. And close combat completes the set with his high physical power.
Gengar @ Black Sludge
EVs: 160 HP / 96 SAtk / 252 Spd
Timid Nature
Ability: Levitate
-Hypnosis
-Will-o-wisp
-Shadow Ball
-Thunderbolt
One of the best hypnosers; with his high speed he tries to put to sleep the opponent and then tries to inflict double status with W-o-W. Shadow ball is really useful with the most of the pokemons and Thunderbolt is to take down Swampert, Milotic.
Garchomp @ Choice Scarf
EVs: 6 HP / 252 Atk / 252 Spd
Jolly Nature
Ability: Sand Veil
-Earthquake
-Fire Fang
-Dragon Claw
-Stone Edge
Without swords dance, he tries to take advantage of choice scarf to take down the much number possible of opponents in one/two turns. His varius moveset can take down a lot of pokemon of different species.
Starmie @ Leftovers
EVs: 236 HP / 56 SAtk / 216 Spd
Timid Nature
Ability: Natural Cure
-Surf
-Thunderbolt
-Rapid Spin
-Recover
I use this Starmie as Special Sweeper and as spinner to eliminate opponent's stealth rock or spikes. He also uses thunderbolt to try to take down other water-types.
Blissey @ Leftovers
EVs: 148 HP / 252 Def / 108 SAtk
Bold Nature
Ability: Natural Cure
-Ice Beam
-Seismic Toss
-Softboiled
-Aromatherapy
This is a simple Blissey, that tries to stay in game a lot of time with softboiled, and when her hp are safe tries to take down some opponents like dragons or rock types. Aromatherapy is useful to cover the absence of lum berry.
Gliscor @ Leftovers
EVs: 252 HP / 6 Atk / 252 Def
Impish Nature
Ability: Sand Veil
-Earthquake
-Arial Ace
-Roost
-Knock Off
Physical wall that tries to do the most damage he can with earthquake, or tries to cause the target to drop his item with knock off. Roost can take him in game a lot of time.

Infernape @ Focus Sash
EVs: 48 Atk / 208 Spd / 252 SAtk
Naive Nature
Ability: Blaze
-Close Combat
-Fire Blast
-Fake Out
-Stealth Rock
I think this is one of the best to start with. He can defeat in a short time Bronzong or he can set stealth rock to take advantage then in the battle. And close combat completes the set with his high physical power.

Gengar @ Black Sludge
EVs: 160 HP / 96 SAtk / 252 Spd
Timid Nature
Ability: Levitate
-Hypnosis
-Will-o-wisp
-Shadow Ball
-Thunderbolt
One of the best hypnosers; with his high speed he tries to put to sleep the opponent and then tries to inflict double status with W-o-W. Shadow ball is really useful with the most of the pokemons and Thunderbolt is to take down Swampert, Milotic.

Garchomp @ Choice Scarf
EVs: 6 HP / 252 Atk / 252 Spd
Jolly Nature
Ability: Sand Veil
-Earthquake
-Fire Fang
-Dragon Claw
-Stone Edge
Without swords dance, he tries to take advantage of choice scarf to take down the much number possible of opponents in one/two turns. His varius moveset can take down a lot of pokemon of different species.

Starmie @ Leftovers
EVs: 236 HP / 56 SAtk / 216 Spd
Timid Nature
Ability: Natural Cure
-Surf
-Thunderbolt
-Rapid Spin
-Recover
I use this Starmie as Special Sweeper and as spinner to eliminate opponent's stealth rock or spikes. He also uses thunderbolt to try to take down other water-types.

Blissey @ Leftovers
EVs: 148 HP / 252 Def / 108 SAtk
Bold Nature
Ability: Natural Cure
-Ice Beam
-Seismic Toss
-Softboiled
-Aromatherapy
This is a simple Blissey, that tries to stay in game a lot of time with softboiled, and when her hp are safe tries to take down some opponents like dragons or rock types. Aromatherapy is useful to cover the absence of lum berry.

Gliscor @ Leftovers
EVs: 252 HP / 6 Atk / 252 Def
Impish Nature
Ability: Sand Veil
-Earthquake
-Arial Ace
-Roost
-Knock Off
Physical wall that tries to do the most damage he can with earthquake, or tries to cause the target to drop his item with knock off. Roost can take him in game a lot of time.