Deviant Art by all0412

Goodra serves as an anti-meta Pokemon capable of withstand some of the strongest special attackers in the VGC format thanks to its colossal base 150 Special Defense stat and utilizing its massive special movepool. Despite the prevalence of Fairy-type Pokemon like the Guardian Deity Tapus, Goodra is perhaps one of the only Dragon-types capable of tanking most of their STAB Fairy-type hits, and immediately retaliating with its Sludge Bomb Poison-type coverage. Thanks to its Dragon-typing and high special defense stat, Goodra can sponge even strong weather-based team bar sand-based teams as it takes little from resisted Fire-/Water-type hits and withstand even super effective Ice-type damage. For abilities, Sap Sipper is by-far the best choice to allow Goodra to effectively counter some of the strongest Grass-types attackers such as Tapu Bulu and Kartana which remain relevant. 

Goodra

Type: Dragon 
Base Stats: 90 HP / 100 Attack / 70 Defense /  110 Special Attack / 150 Special Defense / 80 Speed
Weaknesses:  Dragon [x2] , Ice [x2] , Fairy [x2]
Resistances: Fire [x0.5] , Water [x0.5] , Electric [x0.5], Grass [x0.5]
Immunities: None / Grass [x0] with Sap Sipper
Ability 1 : Sap Sipper  - Grants Grass-type immunity and raises Attack stat if hit by any Grass-type move.
Ability 2: Hydration - Cures Status Conditions (Poison, Sleep, Paralysis, Freeze, Burn) in rain. 
Hidden Ability - Gooey - Reduces speed stat of the attacker by one stage for every direct contact made.
 

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It doesn't take a genius to realize pairing Goodra with the Assault Vest can warrant itself as a stand out special tank. Thanks to the Assault Vest, Goodra can withstand almost any strong special attack, even from at least once from most of the Tapus such as Moonblast from Lele, LO Dazzling Gleam from Koko, and one Specs Moonblast from Fini. Speaking for hard hitting Tapu Bulu, Goodra's Sap Sipper ability negates any damage completely and allows Goodra to completely wall Bulu as it doesn't have a STAB physical Play Rough. Against opposing weather-based teams, Goodra can withstand any multiple STAB Eruptions from Torkoal and Rain-boosted Water-type moves from Pelipper-Golduck and retaliate back with any of its coverage options.

Given how Goodra doesn't need much Special Defense investment, rather the Assault Vest to achieve these benchmarks, players can focus Goodra's Effort Values into either Defense to take physical attacks better, or its special attack to bolster its offensive potential. For this set, this Goodra has a significant HP and Def investment to tank either Z-Earthquake or Dragon Claw from Garchomp, and two Smart Strikes from Kartana. Intimidate and Snarl support from allied Pokemon can allow Goodra with better tank both special and physical attacks, in case players want to allocate more into special attack.

The moveset for this Goodra set is self-explanatory, though its extremely flexible based on the player's team and/or liking. Dragon Pulse is listed first given its a reliable Dragon-type STAB for neutral coverage or for opposing Dragon-types, though rather weak. Draco Meteor allows Goodra to pickup the OHKOs against most Dragon-types and deals better damage in general, though SpA will drop by minus two stages. Sludge Bomb is essential to allow Goodra to stand toe-to-toe against the Tapus and other Fairy-type Pokemon with the added 30% chance to get poisons. Thunderbolt is listed so Goodra can hit opposing Water- and Flying-type Pokemon, notably against Rain-teams.

The last moveslot is up to the player's discretion, though each are viable in certain situations. Flamethrower allows Goodra to target down would be Steel-type checks such as Kartana, Metagross, Celesteela, Vikavolt, Alolan Ninetales, and others for super effective damage. Ice Beam pairs well with Thunderbolt and can hit Ground-, Grass-, and Flying-types. Lastly, Muddy Water is a Water-type spread attack used mainly for Fire-, Ground-, and Rock-types with the added chance to drop the opponents's accuracy. To show the strength of Assault Vest Goodra, here's a list of damage calculations and defensive milestones achieved with its EV Spread and item. 

Offensive Calcs

Weakness Policy

Goodra @ Weakness Policy  
Ability: Sap Sipper  
Level: 50  
EVs: 204 HP / 188 Def / 76 SpA / 36 SpD / 4 Spe  
Modest Nature  
IVs: 0 Atk  
- Dragon Pulse / Draco Meteor
- Sludge Bomb  
- Flamethrower / Thunderbolt / Ice Beam 
- Protect

Milestones:
- EV Spread same as above.
- Life Orb Modest Tapu Koko's Dazzling Gleam has a low chance to 2HKO
- OHKOs most Tapu Koko and Tapu Lele with Weakness Policy boost. 

The following damage calculations show Goodra at +2 Special Attack with the following respective coverage options listed.