What is a good moveset for Toxicroak?

Question

If you have a good competitive moveset for Toxicroak, post an answer below and upvote the best ones. Movesets for its pre-evolutions, if any, can also be shared on this thread.

Be sure to include full set details in your post, e.g. items, abilities, natures and EVs. Some detail, including the intended game mode for your set, is also appreciated. Access the full list of guidelines here.

Toxicroak Pokédex and learnset for reference.

Answer 1

Gen 8 BDSP NU

Toxicroak @ Choice Specs
Ability: Dry Skin
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Focus Blast
- Sludge Bomb
- Shadow Ball
- Vacuum Wave

Special sets for Toxicroak have started to see use in BDSP NU to beat the checks that would check Swords Dance Toxicroak. Choice Specs is one of two special set variants. Choice Specs allows Toxicroak to become a fearsome wallbreaker that threatens most of the metagame.

Focus Blast is Toxicroak's strongest STAB move that hits pretty hard provided it lands. Sludge Bomb is used for your Poison STAB. Shadow Ball allows you to deal super effective damage to Pokemon such as Dusknoir, Chimecho, and Dusknoir. Vacuum Wave is Fighting STAB that is used for priority. Modest Nature maximizes the damage output Choice Specs Toxicroak can have.

Answer 2

Gen 8 BDSP NU

Toxicroak @ Life Orb
Ability: Dry Skin
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Nasty Plot
- Focus Blast
- Sludge Bomb
- Shadow Ball / Vacuum Wave

Nasty Plot is the other special Toxicroak set in BDSP NU. This set also lets you break past the checks of Swords Dance Toxicroak.

Nasty Plot lets you hit things harder upon getting a chance to get a boost. Focus Blast and Sludge Bomb are strong STAB moves that can deal out quite a bit a damage with a +2 Special Attack boost. Shadow Ball is used for coverage against Pokemon such as Drifblim, Dusknoir, and Chimecho, while Vacuum Wave is used for a priority STAB move. Modest Nature and Life Orb is used to help make Toxicroak's moves do more damage since this set uses Toxicroak's Base 86 Special Attack.

Answer 3

Gen 9 NU Swords Dance

Toxicroak @ Life Orb
Ability: Dry Skin
Tera Type: Fighting / Dark / Flying / Fire
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Close Combat
- Gunk Shot
- Sucker Punch

This is the Swords Dance set Toxicroak uses in Gen 9 NU. Swords Dance is used to boost the power of Toxicroak's attacks. Toxicroak finally has access to Close Combat, so it can use a more powerful Fighting STAB. Gunk Shot is used for a powerful Poison STAB that is useful against Pokemon who use Fairy as their Tera Type. Sucker Punch provides Toxicroak with a move than can revenge kill faster Pokemon. Toxicroak has a few useful Tera Types it can use. Tera Fighting allows Toxicroak to have a really powerful Close Combat. Tera Dark not only boosts the power of Sucker Punch, but it also makes Toxicroak immune to both of Bruxish's STABs since it already has a water immunity with Dry Skin. Flying allows Toxicroak to get rid of its ground weakness. Tera Fire is a funny option that allows you to not get burned, allowing you to use Swords Dance in front of Will-O-Wisp Drifblim.

Answer 4

Nat Dex

Toxicroak @ King’s rock
Ability: Poison Touch 

EVs: 252 HP / 28 Atk / 28 SpA / 200 Spe

Jolly Nature

- Substitute

- Focus Blast
- Focus Punch

- Thunder Punch

Details:
SubPunch/Blast.
Subtoxic with poison touch instead of toxic.
Kings rock / thunder punch paraflinch.

Answer 5

The little known gen 9 rain Toxicroak to check threats that are normally problematic for rain teams (Ogerpon-W and Rillaboom to name a few)

Toxicroak @ Rocky Helmet/Leftovers
Ability: Dry Skin
Tera Type: Fairy
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature
- Drain Punch
- Knock Off
- Toxic
- Encore/Protect

DP is STAB that doubles as recovery, and prevents Toxicroak from being too passive
KO is used for item removal, and so Toxicroak isn't completely helpless against the likes of ghosts, especially Gholdengo
Toxic is to make up for lackluster direct damage, and to discourage the opponent from staying on the field
Encore makes it risky for the opponent to set up, while Protect is for scouting and leftovers recovery
Rocky Helmet is for extra chip damage, while Leftovers is for more recovery
Dry Skin is the obvious ability for rain
I chose Tera Fairy, but the best Tera type depends on the rest of your team