I am very very new to ou so this is literally my first team please forgive me if there's any fault.
So garchomp is a very very good mon I think only cause I like it here's my try to build it.

So here's the star of my team. I really love garchomp cause it sets rocks with such ease and is a very very powerful breaker for mons like pult to clean in the end. Yeah so this is a really wierd set tho like going life orb with rocks but I did that so I could easily threaten defoggers like Lando t with high damage after one sd which I feel is great but idk if lefties work here. So earthquake is my main stab and stone edge threatens defoggers and sd is for wall breaking purpose. Please let me know if a better version of chomp exists.

heres the bulky pivot of the team. Corviknight has an awsome synergy with chomp. It's here to take really powerful hits like specs lele moonblast etc and also defog with ease. I chose pressure as the ability to pp stall tspikes from toxapex and also pp stall opposing defog and this thing works really well. I decided to keep bravebird instead of iron head as for buzzwole as this thing is no joke to my team. So Brave Bird is enough to check it cause it has nothing else to check me in turn. Slow u turn really helps in my team for pult to set up and sweep like hell.

Now I think I am crazy to keep this dragon onto my team but i had to cause i didnt find any set up mon better than this one. But if there is feel free to suggest :). So i aint very happy with this mon but am keeping is for now as it is deadly sweeper with wish support. Phantom force is partly used move but its mainly ddarts that made me keep this mon. Clear body helps avoiding intim. U turn is a good move that helps this mon no to get into a mess.

Now i needed a resist to rain teams as its a very common playstyle. also it takes ice beams and has spikes for pult to sweep easily. gyro ball is my actual means to check fairies. leech seed is the recovery.

Now I needed a resist to landorus so this is what I bought. Buzzwole has a whooping defense stat with roost which makes it a good check to Lando and item was boots to avoid damage from tspikes etc.
Earthquake is to surprise heatran and toxapex and it helps. Close combat is a stab move.

Now here on this slot I needed a check to dragons. So my choice was clef over others as it also provides wish support with teleport which helps my sweepers to sweep. Moonblast is my stab and I needed to keep protect for wish isn't very good without it. I does help recovering mons like chomp/pult to sweep again or even others as the game progresses.
Now I know the team is t very viable but I gave it my best as I am building for the first time and I would also consider options like scale shot chomp with rocks on heatran but idk if that works here.
So garchomp is a very very good mon I think only cause I like it here's my try to build it.

Garchomp @ Life Orb
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Stealth Rock
- Earthquake
- Stone Edge
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Stealth Rock
- Earthquake
- Stone Edge
So here's the star of my team. I really love garchomp cause it sets rocks with such ease and is a very very powerful breaker for mons like pult to clean in the end. Yeah so this is a really wierd set tho like going life orb with rocks but I did that so I could easily threaten defoggers like Lando t with high damage after one sd which I feel is great but idk if lefties work here. So earthquake is my main stab and stone edge threatens defoggers and sd is for wall breaking purpose. Please let me know if a better version of chomp exists.

Corviknight @ Leftovers
Ability: Pressure
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Defog
- Roost
- U-turn
- Brave Bird
Ability: Pressure
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Defog
- Roost
- U-turn
- Brave Bird
heres the bulky pivot of the team. Corviknight has an awsome synergy with chomp. It's here to take really powerful hits like specs lele moonblast etc and also defog with ease. I chose pressure as the ability to pp stall tspikes from toxapex and also pp stall opposing defog and this thing works really well. I decided to keep bravebird instead of iron head as for buzzwole as this thing is no joke to my team. So Brave Bird is enough to check it cause it has nothing else to check me in turn. Slow u turn really helps in my team for pult to set up and sweep like hell.

Dragapult @ Life Orb
Ability: Clear Body
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Dragon Darts
- U-turn
- Phantom Force
Ability: Clear Body
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Dragon Darts
- U-turn
- Phantom Force
Now I think I am crazy to keep this dragon onto my team but i had to cause i didnt find any set up mon better than this one. But if there is feel free to suggest :). So i aint very happy with this mon but am keeping is for now as it is deadly sweeper with wish support. Phantom force is partly used move but its mainly ddarts that made me keep this mon. Clear body helps avoiding intim. U turn is a good move that helps this mon no to get into a mess.

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Leech Seed
- Spikes
- Power Whip
- Gyro Ball
Ability: Iron Barbs
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Leech Seed
- Spikes
- Power Whip
- Gyro Ball
Now i needed a resist to rain teams as its a very common playstyle. also it takes ice beams and has spikes for pult to sweep easily. gyro ball is my actual means to check fairies. leech seed is the recovery.

Buzzwole @ Heavy-Duty Boots
Ability: Beast Boost
EVs: 252 HP / 88 Atk / 168 Def
Impish Nature
- Close Combat
- Earthquake
- Ice Punch
- Roost
Ability: Beast Boost
EVs: 252 HP / 88 Atk / 168 Def
Impish Nature
- Close Combat
- Earthquake
- Ice Punch
- Roost
Now I needed a resist to landorus so this is what I bought. Buzzwole has a whooping defense stat with roost which makes it a good check to Lando and item was boots to avoid damage from tspikes etc.
Earthquake is to surprise heatran and toxapex and it helps. Close combat is a stab move.

Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Wish
- Teleport
- Protect
- Moonblast
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Wish
- Teleport
- Protect
- Moonblast
Now here on this slot I needed a check to dragons. So my choice was clef over others as it also provides wish support with teleport which helps my sweepers to sweep. Moonblast is my stab and I needed to keep protect for wish isn't very good without it. I does help recovering mons like chomp/pult to sweep again or even others as the game progresses.
Now I know the team is t very viable but I gave it my best as I am building for the first time and I would also consider options like scale shot chomp with rocks on heatran but idk if that works here.