Rate my Gen 8 National Dex Team for Showdown?

Question

Slowbro @ Leftovers
Ability: Regenerator
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Scald
- Psyshock
- Slack Off
- Teleport

Froslass (F) @ Leftovers
Ability: Cursed Body
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Spikes
- Ice Beam
- Taunt
- Destiny Bond

Farfetch’d @ Leek
Ability: Inner Focus
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- First Impression
- Roost
- Brave Bird
- U-turn

Zygarde-10% @ Focus Sash
Ability: Aura Break
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Outrage
- Dragon Dance
- Earthquake
- Stone Edge

Rotom-Mow @ Light Clay
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Reflect
- Light Screen
- Leaf Storm
- Volt Switch

Virizion @ Leftovers
Ability: Justified
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Substitute
- Calm Mind
- Giga Drain
- Focus Blast

Is the team good? If not, what can make the team better?

Answer 1

Let's see.
Slowbro and froslass looks good.

Why farfetch'd? Sirfetch'd is serprior in almost every aspect. Sirfetch'd is more offensive based though. If u don't want sirfetch'd u can run other pokemon with better stats like unfezant or even Pidgeot

Rotom? Has decent bulk bit I feel pranksters are better setters. Exchange it with grimmsnarl.
Set:
grimmsnarl @light clay
Ability: prankster
EVs and nature u decide whether u want to make it tanky or screen setter+ attacker
Moves:
Light screen
Reflect
Spirit break/darkest lariat
Thunder punch?
Choose the last move. Spirit break/ darkest lariat works as coverage and STAB. Thunder punch can work as coverage as to make up for losing rotom but other moves are probably better. Grass is covered by virizion

Virizion is normally run as physical as greater move options and more reliable fighting STAB in close combat or scared sword and use of ability. Special is still okay though.

Answer 2

I can easily see you understand that having Pokemon of the same type is a waste I respect you for that you teams awesome maybe a sirfetch'd will do and focus on moves that suit their stats
Virizion is capable of super sweeping
With Adamant Nature
Swords dance
Close combat
Grassy glide
And any thing you want thanks to it's speed and attack it can take em out before the get the chance to blink gud luck :b