National Dex Can anyone give me constructive criticism about my team

[DwightGiovanni]

I'm new to National Dex and I've used this team a couple of times and would like to ask how to improve it

Here's the team

Charizard-Mega-Y (M) @ Charizardite Y
Ability: Blaze
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Flamethrower
- Air Slash
- Focus Blast
- Solar Beam

It's your basic Charizard-Y from past gens, nothing special, but it's what I mainly use in wall breaking

Garchomp (F) @ Rocky Helmet
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Dragon Claw
- Stealth Rock
- Rock Slide

This Garchomp sets stealth rocks and is your standard one, Earthquake is a must have obviously

Darmanitan-Galar (M) @ Choice Scarf
Ability: Gorilla Tactics
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Flare Blitz
- Icicle Crash
- Stone Edge

My glass cannon, Darmanitan is used to mainly attack and be used to wall break or clean the remaining Pokemon

Zapdos @ Leftovers
Ability: Static
EVs: 248 HP / 128 Def / 20 SpA / 112 SpD
Modest Nature
IVs: 0 Atk
- Defog
- Protect
- Roost
- Volt Switch

Zapdos is used to defog hazards and screens, that's just it

Grimmsnarl (M) @ Darkinium Z
Ability: Prankster
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Sucker Punch
- Fake Out
- Thunder Wave
- Spirit Break

Grimmsnarl is used to paralyze the opponent and is basically the one who has a safety hazard Darkinium Z in case something happens

Melmetal @ Assault Vest
Ability: Iron Fist
EVs: 232 HP / 252 Atk / 24 SpD
Adamant Nature
- Double Iron Bash
- Earthquake
- Thunder Punch
- Ice Punch

He is used as the main tank in the team, he's the one I switch out to in case a Pokemon can't survive a hit

It's nothing really special I really want to know how this team can fare against the meta

 

[Twilight]

Hi, welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide at least 3 lines of descriptions for each Pokemon to explain their roles, you are also missing importables. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.