Hazard stacking Balance team for National Dex

Question

Regieleki @ Choice Specs
Ability: Transistor
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Volt Switch
- Thunderbolt
- Ancient Power
- Rapid Spin

Toxapex @ Black Sludge
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 152 Def / 104 SpD
Bold Nature
- Toxic Spikes
- Scald
- Knock Off
- Recover

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 156 Def / 100 SpD
Careful Nature
- Spikes
- Stealth Rock
- Leech Seed
- Body Press

Greninja-Ash (M) @ Choice Specs
Ability: Battle Bond
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Hydro Pump
- Dark Pulse
- Ice Beam
- Grass Knot

Serperior @ Leftovers
Ability: Contrary
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Leaf Storm
- Hidden Power [Fire]
- Dragon Pulse
- Leech Seed

Charizard-Mega-Y @ Charizardite Y
Ability: Blaze
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Focus Blast
- Scorching Sands

• Regieleki is an offensive pivot and wallbreaker/sweeper that can take great advantage of the hazards laid on the field with Volt Switch, which forces a lot of switches and weakens the opposition.

• Toxapex has amazing defensive synergy and can litter the field with Toxic Spikes so that anything that survives the offensive members will be worn down. Knock Off catches a lot of things trying to switch in, most importantly Heavy-Duty Boots Blissey, which will get worn down by Toxic Spikes the next time she switches in. Since Toxapex has multiple great defensive traits such as Regenerator (which ignores Stealth Rock and up to 2 layers of Spikes), an immunity to Toxic, the ability to absorb Toxic Spikes, Toxic Spikes, reliable recovery, the ability to burn, a Fire and Fighting resistance, insane bulk, and something else I probably forgot because it's so versatile and good, it is the most perfect partner for Ferrothorn you can find.

• Ferrothorn also has very valuable defensive use, and has Spikes and Stealth Rocks, which Pex lacks. It also can force switches with its defensive typing and access to Leech Seed. With its beefy defense stat, notable resists, Toxic immunity, Stealth Rock resistance, and Iron Barbs, it can switch into many things. Body Press is for other Ferrothorn, Tyranitar, and Blissey. It resists Psychic and Electric type moves and is neutral to Ground, making it an incredible partner for Toxapex. EVs are to ensure it always lives Waterium Z Protean Greninja's HP Fire after Stealth Rock, while also ensuring it will always survive Fightinium Z Low Kick without hazards. It is also never 2HKOed by Landorus-Therian's Earthquake, even after Rocks.

• Ash-Greninja is the main offensive Pokemon. The Ground type that's blocking Regieleki will just get Hydro Pumped or Ice Beamed. Dark Pulse is a STAB move with 100% accuracy and a decent flinch rate.

• Serperior can break past walls like Toxapex, Ferrothorn, and Blissey with Leaf Storm or Hidden Power Fire. Blissey is a harder to get rid of, so Serperior can use Leech Seed on the switch. Leech Seed also helps Serperior deal with Heatran more easily.

• Mega Charizard Y is a very powerful wallbreaker which 2HKOes or OHKOes almost everything. Fire Blast is the Fire move of choice. The other moves are coverage. Focus Blast slams Tyranitar, the most common Rock type. Scorching Sands is good coverage and allows Charizard to spread burns more consistently than with Fire Blast.

Comments

Are there any other moves that lower serperior's stats? (that are viable)

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I usually use Extrasensory on Ash-Greninja to cover Fighting types. What does Grass Knot deal with that Hydro Pump/Ice Beam can't? (That's a genuine question I have no clue)

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@TPB No, only Leaf Storm
@X Tapu Fini, Mega Swampert, and opposing Greninja. I'm starting to realize it's a pretty weird move to have on AG so I'll probably replace it

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@SSuperiority, Greninja takes 60 BP damage from Grass Knot, Tapu Fini only 40 BP while M-Swampert a fairly good 100 BP. There are much better choices to cover these mons.

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Run Glare on Serperior. This team has a kinda bad matchup against Blissey, you lack any real physical attackers. Greninja+Mega Charizard Y isn't always a good combo, and as told above go for something else over Grass Knot so that you can have additional coverage. Dragon Pulse isn't a lot of coverage, hitting only Dragonite and Salamence, which are now rare. So, you can go something like SubSeed Serperior. Also consider Haze on Toxapex. If Volcarona manages to get some Quiver Dances, it's impossible for this team to break.