National Dex Nat Dex Ubers team please help!!!

[revolthavoc34]

Blastoise-Mega @ Blastoisinite​

Role: Special Attacker / Setup Sweeper
EVs: 252 SpA / 4 SpD / 252 Spe
Nature: Modest
IVs: 0 Atk
Moves:

• Dark Pulse
• Hydro Pump
• Ice Beam
• Shell Smash

Blastoise-Mega functions as a powerful special attacker, utilizing Shell Smash to boost its Speed and Special Attack, allowing it to outspeed and hit harder. With a Modest nature and a full Special Attack investment, it can dish out devastating hits with Hydro Pump, Ice Beam, and Dark Pulse. Tera Type Water further boosts the power of its Water-type moves, making it an excellent offensive threat once it gets its setup boost. it is also one of my favorites and i want it to stay on the team.

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Charizard @ Heavy-Duty Boots​

Role: Special Attacker / Utility
EVs: 252 SpA / 4 SpD / 252 Spe
Nature: Timid
IVs: 0 Atk
Moves:

• Hurricane
• Flamethrower
• Scorching Sands
• Will-O-Wisp

Charizard serves as a versatile special attacker with Heavy-Duty Boots to avoid entry hazards, ensuring it can maintain offensive pressure. Its Blaze ability powers up its Fire-type moves when low on HP, making Flamethrower even deadlier. Scorching Sands provides coverage against Fire-resistant foes, while Will-O-Wisp can cripple physical attackers. Tera Type Ground grants immunity to Electric-type moves and enhances its offensive potential against Steel-types.

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Garganacl @ Electric Seed​

Role: Physical Tank / Hazard Setter
EVs: 248 HP / 36 Def / 224 SpD
Nature: Impish
Moves:

• Salt Cure
• Stealth Rock
• Protect
• Recover

Garganacl is a defensive powerhouse with Purifying Salt, boosting its resistance to status conditions while reducing Ghost-type damage. By using Electric Seed, it increases its Defense stat in Electric terrain, making it even harder to break down physically. Stealth Rock allows it to set hazards, while Salt Cure wears down opposing Pokémon. Protect and Recover provide reliable healing, allowing Garganacl to stay on the field longer as a bulky defensive option.

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Giratina-Origin @ Griseous Core​

Role: Support / Hazard Control
EVs: 248 HP / 136 Atk / 60 Def / 52 SpD / 12 Spe
Nature: Adamant
Moves:

• Poltergeist
• Dragon Tail
• Defog

Giratina-Origin excels as a bulky utility mon with a unique combination of support moves and resistances. Levitate grants immunity to Ground-type moves, and Griseous Core boosts its offensive capabilities. Defog helps clear hazards, supporting its team by maintaining a safe battlefield. Poltergeist provides strong Ghost-type STAB, while Dragon Tail forces switches, disrupting setups. With its high bulk and versatile movepool, Giratina-Origin is a fantastic pivot and support option.

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Kyurem-White @ Choice Specs​

Role: Special Attacker / Wallbreaker
EVs: 252 SpA / 4 SpD / 252 Spe
Nature: Timid
IVs: 0 Atk
Moves:

• Ice Beam
• Focus Blast
• Earth Power
• Flash Cannon

Kyurem-White is a potent wallbreaker, utilizing Choice Specs to maximize its already impressive special attacking stats. With access to Turboblaze, it can bypass any Substitute or Protect, ensuring its powerful moves land. Ice Beam is its primary STAB move, while Focus Blast and Earth Power offer coverage against Steel-types and other threats. Flash Cannon rounds out its coverage, allowing it to hit Fairy-types and other opposing Pokémon for solid damage.

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Tapu Koko @ Tapunium Z​

Role: Special Attacker / Utility / Support
EVs: 252 SpA / 4 SpD / 252 Spe
Nature: Timid
IVs: 0 Atk
Moves:

• Nature's Madness
• Thunderbolt
• Light Screen
• Reflect

Tapu Koko is a versatile special attacker that supports its team with Electric Surge, activating Electric Terrain to boost the power of its Electric-type moves. Nature's Madness helps chip away at bulky opponents' health, while Thunderbolt provides a reliable STAB option. Light Screen and Reflect give it the ability to set up dual screens, protecting its team from special and physical hits. With its Tera Type Electric and access to Tapunium Z, Tapu Koko can unleash a powerful Z-move to break through walls when necessary.

 

[bumboclaat]

Hi, with the exception of Giratina-O all of these Pokemon are considered unviable. The Viability Rankings are currently in the process of being updated, but it is best to give those a look. If you are looking to make a screens team I can help with that if you'd like. Also this comes across as AI generated with the exception of your last sentence in the Mega Blastoise paragraph. I'm fairly sure using AI is not allowed, but even if it is I'd recommend writing the blurbs yourself.

 

[Bobsican]

Well, this sure was a surprise, first off I have to remind that Mega Evolved species (such as M-Blastoise) can't Terastallize, and neither can species bound to a Z-Crystal (in this case Tapu Koko), secondly Turboblaze does not let Kyurem-W bypass Substitute or Protect, as the ability only lets it bypass certain abilities instead.

Now, as for the team itself, as mentioned by bumboclaat , only Giratina-O, as well as Garganacl are viable in the metagame, per RMT rules, this team can't be rated properly as to do so would basically require building a whole team as the only two Pokemon remaining only enable a core for quite a variety of teams with little identity left, especially for your intent of using M-Blastoise.

Here I'll go in detail over what outclasses each of the other four Pokemon to hopefully give you teambuilding ideas for next time:

Charizard
Besides not explaining what Hurricane is meant to do, this acts as if it had all-rounder traits to pull an offensive support set, which only works in the far lower power level of ZU, in here, besides being outclassed by Primal Groudon as it gets the boost granted by Blaze inherently over requiring an HP gimmick, Ground STAB to hit harder with the nearly unresisted Fire + Ground combination, far higher stats to cover a good portion of the metagame and earn its S+ rank placement in the Viability Rankings, results in a very outclassed Pokemon that does not really handle much compared to other tried-and-true options in the tier.

Tapu Koko
Besides screens being rather niche in the current metagame as they can be inconsistent out of losing a good amount of momentum early game and being disruptible with the trend of phazing and Defog in the tier (especially as Defog is a fairly common move compared to regular SV tiers in lack of movexit), results in a Pokemon with no real niche. While it may have had this niche in USUM Ubers, it's not effective as an anti-lead anymore as Smeargle can play around Taunt with moves like Stone Axe, Ceaseless Edge and Mortal Spin, as well as the nerf on Electric Terrain since Gen 8 also resulting on lacking offensive pressure even with the unreliable Thunder. Ultimately if you really want this niche you'd want to keep an eye on Grimmsnarl.

Kyurem-W
Its high stats can call attention from a glance, especially as a good portion of the tier is weak to Ice, however, it has the glaring issue of being too slow and not really checking much at all as its typing is lacking defensively, and a weakness to Stealth Rock doesn't help, making it hard to justify over Rayquaza, Chi-Yu, and especially Eternatus.

M-Blastoise
The tier is full of Taunt, attackers that can easily 2HKO Blastoise, and phazing (aka, moves that force a switch like Whirlwind and Dragon Tail), meaning that this struggles finding a chance to setup, and even then it struggles breaking past stuff like Primal Kyogre, Primal Groudon, and Tera Fairy Lunala. Being vulnerable to priority from any foe such as Marshadow, Chien-Pao, Arceus, and Deoxys-A also does no favors, ultimately leaving this as too unreliable to use properly over fast sweepers like the trending Dragon Dance users in Necrozma-DM and Arceus-Ground, or the classic staple known as Extreme Killer Arceus (Swords Dance + Extreme Speed).

Also worth noting that Giratina-O has a weird EV spread and an empty move slot, and Garganacl's EV spread is also unusual and left unexplained, and the latter can't really make use of Electric Seed as it's a defensive Pokemon without setup, even if the rest of the team was somehow fine, it's rather anti-synergistic as it's going to switch out often, wasting the item.

Finally, also note that you can also try aiming for National Dex Ubers UU, in which this team could be way more workable bar the exception of Giratina-O and Tapu Koko as the former is banned over there, and the latter is unranked (meaning that it has not shown any relevance over other options in the current metagame), but it does notably has a viable M-Blastoise. Otherwise you may want to try out sample teams to get more familiar with the tier, then lurk around to get more customized.