[RATE MY TEAM] Pretty terrible vgc 2017 team

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This is a team I made for the vgc 2017 format. I am really new to competetive so please be brutally honest!

Gyarados @ Waterium Z  
Ability: Intimidate  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Waterfall  
- Protect  
- Dragon Dance  
- Ice Fang  

This is what I started the team with. I knew gyarados was 4x weak to electric attacks, so I added alolan marowak with lightning rod to counter that weakness and to give me time to set up dragon dance. I added ice fang to deal with garchomp and the waterium z to get ohkos on most pokemon.

Marowak-Alola @ Thick Club  
Ability: Lightning Rod  
EVs: 252 HP / 252 Atk / 4 SpD  
Brave Nature  
- Shadow Bone  
- Flare Blitz  
- Protect  
- Bonemerang  

This was added to check a few of gyaradoses weaknesses and to fill the bulky sweeper slot on my team. Standard marowak.

Garchomp @ Focus Sash  
Ability: Rough Skin  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Earthquake  
- Dragon Claw  
- Protect  
- Rock Slide  

I added this pokemon because I knew marowak had a lot of checks against it, so I could use this and spam earthquake instead of sending out marowak.

Tapu Koko @ Life Orb  
Ability: Electric Surge  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Dazzling Gleam  
- Protect  
- Thunderbolt  
- Discharge  

I added this for an alternative pair for marowak and garchomp.

Arcanine @ Sitrus Berry  
Ability: Intimidate  
Level: 50  
EVs: 252 HP / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Protect  
- Snarl  
- Will-O-Wisp  
- Flamethrower  

Needed a bulky cripple pokemon so I added this.

Kartana @ Choice Scarf  
Ability: Beast Boost  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Leaf Blade  
- Smart Strike  
- Sacred Sword  
- Protect  

My favorite filler.


Genereally this team has way too many checks and counters and Im not sure how to fix that. Rate my first team please?