What are all the "drastic" moves?

Question

Cotton guard raises a Pokemon's defense drastically. What are the other drastic moves? That's the only one I've seen.

Answer 1

As of Generation 9, the only moves that can "drastically" raise a stat are:

Cotton Guard: +3 Defense
Fell Stinger: +3 Attack if it KOs a Pokemon
Tail Glow: +3 Special Attack
Z-Splash: +3 Attack

There's also the X "stat" 3 in-game items, like the X Attack 3, which boost a stat by 3 stages; however, that cannot be used in online battles. (And then there's X "stat" 6, which supposedly immensely boosts a stat, but that's not a drastic boost so I'm only mentioning it.)

However, with the ability Simple and a move that "sharply" raises a stat, you can change a move that's supposed to give a +2 boost into one that gives +4. For example, Nasty Plot sharply raises Special Attack (+2 Special Attack), but with the ability Simple, that will change to +4 Special Attack and will say that the move "drastically" raised Special Attack.

Here are all the moves that can achieve this (with Simple, of course):
(if the move is directed towards an a target Pokemon, that Pokemon that gets their stat boosted must have Simple, not the user)

Acid Armor: +2 Defense
Acupressure: +2 to a random stat (excluding accuracy and evasion)
Agility: +2 Speed
Amnesia: +2 Special Defense
Autotomize: +2 Speed, user's weight is halved (becomes nimble)
Barrier: +2 Defense
Decorate: +2 Attack and Special Attack to target Pokemon
Diamond Storm: Chance to provide +2 Defense after attack
Fillet Away +2 Attack, Special Attack, and Speed, but loses half health
Geomancy: +2 Special Attack, Special Defense, and Speed after a charging turn
Growth: +1 Attack and Special Attack, +2 if under Sun
Minimize: +2 Evasion
Nasty Plot: +2 Special Attack
Rock Polish: +2 Speed
Shell Smash: +2 Attack, Special Attack, and Speed, but -1 Defense and Special Defense
Shelter: +2 Defense
Shift Gear: +2 Speed and +1 Attack
Spicy Extract: +2 Attack and -2 Defense to target Pokemon
Stuff Cheeks: +2 Defense, in addition to using the user's held berry
Swagger: +2 Attack to target Pokemon and confuses it
Swords Dance: +2 Attack
Z-Ally Switch: +2 Speed
Z-Aromatic Mist: +2 Special Defense
Z-Bestow: +2 Speed
Z-Captivate: +2 Special Defense
Z-Heal Block: +2 Special Attack
Z-Imprison: +2 Special Defense
Z-Last Resort from Eevee (Extreme Evoboost): +2 Attack, Defense, Special Attack, Special Defense, and Speed
Z-Magic Coat: +2 Special Defense
Z-Me First: +2 Speed, then calls a Z-Move
Z-Mirror Move: +2 Attack, then calls a Z-Move
Z-Powder: +2 Special Defense
Z-Psycho Shift: +2 Special Attack
Z-Recycle: +2 Speed
Z-Snatch: +2 Speed
Z-Switcheroo: +2 Speed
Z-Trick: +2 Speed

Additionally, here are all the moves that can drastically lower a stat (again, with Simple):
(if the move is directed towards an a target Pokemon, that Pokemon that gets their stat boosted must have Simple, not the user)

Acid Spray: -2 Special Defense to target Pokemon
Captivate: -2 Special Attack to all adjacent opposing Pokemon if of opposite gender
Charm: -2 Attack to opposing Pokemon
Draco Meteor: -2 Special Attack after attack
Eerie Impulse: -2 Special Attack to target Pokemon
Fake Tears: -2 Special Defense to target Pokemon
Feather Dance: -2 Attack to target Pokemon
Fleur Cannon -2 Special Attack after attack
G-Max Foam Burst: -2 Speed to all opposing Pokemon after attack
Leaf Storm: -2 Special Attack after attack
Lumina Crash: -2 Special Defense to target Pokemon after attack
Memento: -2 Attack and Special Attack to target Pokemon, user faints
Metal Sound: -2 Special Defense to target Pokemon
Obstruct: -2 Defense to any Pokemon making contact, in addition to protecting from damaging attacks
Overheat: -2 Special Attack after attack
Psycho Boost: -2 Special Attack after attack
Scary Face: -2 Speed to target Pokemon
Screech: -2 Defense to target Pokemon
Seed Flare: Chance to -2 Special Defense to target Pokemon after attack
Spicy Extract: -2 Defense and +2 Attack to target Pokemon
Spin Out: -2 Speed after attack
String Shot: -2 Speed to target Pokemon
Sweet Scent: -2 Evasion to foe(s) Pokemon

There's also the X "stat" 2 items, which now boost a stat by 4 stages and thus drastically boosts a stat.

Finally, a few held items can drastically boost a stat when activated.

Blunder Policy: +2 Speed if move misses because of accuracy
Starf Berry: +2 to a random stat (excluding accuracy and evasion) when HP is 25% or lower
Weakness Policy: +2 Attack and Special Attack if hit by a super effective move

Comments

There are a few missing moves that sharply raise/lower stats, such as Growth while under the effects of sunlight, Seed Flare, Psycho Boost, Captivate, etc.

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I added Growth, Seed Flare, and Psycho Boost, but I already had Captivate lol

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Oh, lol. There may be a few more missing though, so it might be worth double checking.
Edit: It might also be worth including held items such as the Weakness/Blunder Policy and Starf Berry, as well as the X-Items (assuming they are affected by Simple).

Answer 2

There are only 2 Drastically Raising moves-

• Cotton Guard (+3 defense)
• Tail Glow (+3 sp.attack

There is also Quiver Dance, Shell Smash, Shift Gear, Coil which raise a total of 3 stages but in different stats.

You can also use X Attack 3 which raises by 3 levels (drastically) or X Attack 6, which raises all he way to the top with 6 levels (immensely).
Of course, this goes with X Special Attack and all the other stats.

Sorry MewC i copied some of your answer
Hope this helps =P

Comments

I just added a little bit to your answer :)

Answer 3

Currently, the only move that raises stats drastically is cotton guard and tail glow(+ 3 Sp Attack). Though, if you are WiFi battling with the wonder launcher, you can get X Attack 3 which raises by 3 levels (drastically) or X Attack 6, which raises all he way to the top with 6 levels (immensely).
Of course, this goes with X Special Attack and all the other stats.
There is also Quiver Dance, Shell Smash, Shift Gear, Coil which raise a total of 3 stages but in different stats.
I hope this helped!

Answer 4

as the other guy said before

"There are only 2 Drastically Raising moves-

Cotton Guard (+3 defense)
Tail Glow (+3 sp.attack
There is also Quiver Dance, Shell Smash, Shift Gear, Coil which raise a total of 3 stages but in different stats.

You can also use X Attack 3 which raises by 3 levels (drastically) or X Attack 6, which raises all he way to the top with 6 levels (immensely).
Of course, this goes with X Special Attack and all the other stats.

Sorry MewC I copied some of your answer
Hope this helps =P"

there is 1 more move that raises stats drasticly, its fell stinger under the conditon that it kos another Pokemon. not many Pokemon learn this move.

Comments

There's also belly drum, which technically maxes the stat instead of raising it by a certain number of stages, but it's effectively a bigger stat boost than the "drastic" boosts.

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It's not coded to specifically max the attack. It does have a fixed number of stages: 12. Since that is the most stat difference possible, it always maxes out attack.