Rate my VGC 2021 team

Question

I've been trying to build a competitive team centered around solar power Charizard and Heliolisk.

Whimsicott @ Focus Sash
Ability: Prankster
Level: 50
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Sunny Day
- Tailwind
- Moonblast
- Taunt

Charizard-Gmax @ Assault Vest
Ability: Solar Power
Level: 50
Gigantamax: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Blast Burn
- Air Slash
- Scorching Sands
- Solar Beam

Heliolisk @ Choice Specs
Ability: Solar Power
Level: 50
EVs: 252 SpA / 200 SpD / 52 Spe
Modest Nature
IVs: 0 Atk
- Dark Pulse
- Hyper Voice
- Thunderbolt
- Protect

Urshifu-Rapid-Strike-Gmax @ Muscle Band
Ability: Unseen Fist
Level: 50
Gigantamax: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Surging Strikes
- Close Combat
- Poison Jab
- Detect

Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
Level: 50
EVs: 252 Atk / 252 Def / 4 Spe
Jolly Nature
- Behemoth Blade
- Play Rough
- Dig
- Protect

Rillaboom @ Rose Incense
Ability: Grassy Surge
Level: 50
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Fake Out
- Grassy Glide
- High Horsepower
- Brick Break

Whimsicott is the sun setter/ tailwind support, and can taunt trick roomers if needed.

Charizard and Heliolisk are the solar power sweepers. Nothing special about the Zard, the assault vest is for special water and electric moves, but the Heliolisk is built to resist and counter Kyogre, Spectrier, and Shadow Rider.

Urshifu is for opposing fire types and special walls.

Zacian is for cleaning up/early wallbreaking, and it's behemoth blade can help against ice rider and glastrier (even more so if they're dynamaxed).

Rillaboom is for fake out support and a counter to Groudon since it can take out my Zard, Lisk, and Zacian. Brick break also helps with screens.

Comments

I would consider these changes:
1. LO Charizard
LO + Sun boosted Charizard can hit for serious damage. Assault vest isn't so optimal because Charizard is typically used as a nuke.
2. Helioisk sounds good, but most Calyrex-Shadows are paired up with Indeedee, who can redirect your dark pulses.
252 SpA Life Orb Calyrex-Shadow Max Mindstorm vs. 0 HP / 4 SpD Dynamax Heliolisk: 179-212 (65.3 - 77.3%) -- guaranteed 2HKO
Helping Hand + Mindstorm would then KO.
As a result, I would suggest changing Heliolisk.

3. Zacian feels a bit odd here. Most sun teams have Groudon/Charizard/Venusaur and they synergize really well. If you're trying to make an anti-meta sun team without Groudon, just use Torkoal instead of Venusaur. The main issue with having Whimsicott setting sun is that the opponent can lead with fake out pressure and you would have to switch Whimsicott out. It's either you swap taunt or tailwind for protect or use Groudon/Torkoal.

4. Urshifu is also a bit weird on a sun team. Just keep in mind that sun halves water moves' damage output by half. Therefore, if you're hitting something super effectively with Surging Strikes, you're technically doing neutral damage in sun. Additionally, muscle band isn't a great item. I think you might have made a type because it should probably be choice band according to this team.

5. Rillaboom with brick break is also kind of weird. Consider replacing it with Venusaur. Venusaur can threaten Grimmsnarl and lapras by making them go to sleep, which is an alternate way of dealing with screens. Venusaur also has a good match up against Lapras.

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Some advice:

1 - Don't use AV Charizard. Life Orb is so much better, and you really want Max Guard. Charizard isn't meant to be bulky, he is meant to destroy everything before it gets knocked out.
2 - Don't rely on Whimsicott to get the weather on, use Groudon or Torkoal
3 - Heliolisk isn't viable in the meta, it is so frail, and getting that chip damage from Solar Power reallly hurts you.
4 -About Urshifu, some questions: Why it doesn't have Aqua Jet? Why not the Dark one? If you really want to use it, why not make it hold an Utility Umbrella?
5 - Why Dig on Zacian? You should replace it with Swords Dance, Sacred Sword or Subsitute, also, why is it here? You should use Groudon in a sun team
6 - Rillaboom set feels weird here. You should use him AV, and consider switching Brick Break for Wood Hammer

Some other things, you have 2 grass types in a sun team, which makes you super weak to opposing sun teams. I would consider running Venusaur instead of Rillaboom, Groudon instead of Zacian, and remove Heliolisk and Urshifu Rapid Strike from the team.