Not every set can or should be self-improof. If you try to build this way, your team will not be optimal for facing the rest of the threats in the metagame. Another method of improofing your team is to use a teammate to check the Imposter of another teammate. Look at the examples below for further explanation.
Improofing Offensive Mons with Defensive Teammates

Zamazenta-Crowned @ Choice Band
Ability: Intrepid Sword
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Adamant Nature
- Close Combat
- Sunsteel Strike
- U-turn
- Earthquake / Fishious Rend

Golisopod @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD
Relaxed Nature
IVs: 0 Spe
- U-turn
- Spiky Shield
- Glare
- Stealth Rock
This is one of the most common and reliable improofing methods. This Zamazenta-C is threatened to be OHKOed by Imposter using Close Combat due to Intrepid Sword's mechanics making Imposter have +2 Attack. Zama-C can only hope to 2HKO Eviolite Imposter in return so Golisopod comes in to serve as the improof. Golisopod naturally resists Zama-C's STAB moves and has nice physical defense to help it stomach boosted attacks from Imposter. Coverage moves, like EQ or Fishious Rend, can be chosen to help Zama-C's moveset be optimal for hitting as much as possible while still making Golisopod a good improof. The Golisopod set is built to both absorb the Imposter Zama-C's attacks and cripple it and gain momentum on it at the same time. If the Imposter decides to stay in, Golisopod can Glare it or set Stealth Rock at no cost, or just U-turn out as Imposter is forced to switch out.
Improofing offensive mons with defensive teammates can look very different depending on the offensive mon of choice. Abilities like Fur Coat and Ice Scales are great for improofing Physical and Special Attackers, respectively. Some examples of this include things like all-out-attacker Zacian-Crowned with Fur Coat Seismitoad to improof and Adaptability Lunala with Ice Scales Incineroar to improof. There are also options like Flash Fire, Volt Absorb, and similar immunity abilities that stop Imposter from taking advantage of offensive mons.
Improofing Defensive Mons with Defensive Teammates
Another extremely important aspect of improofing is improofing defensive team members. Imposter loves coming in on defensive mons and getting free opportunities to steal your healing moves and become super bulky, so you have to limit how much it can do this. But as I mentioned before, not every set is going to be self-improof and this includes defensive mons. Running Anchor Shot or other trapping moves on every defensive team member is not a good strategy and can get you in trouble in certain matchups. Pivot moves are great in Balanced Hackmons because you can run them on anything you want and they are very useful to help keep momentum on your side. Pivot moves also help get you out of trouble and avoid being trapped yourself and falling victim to things like Imprison + Transform or Soundproof Perish Song. So if you want to run moves like Teleport, U-turn, or Parting Shot on your wall then go for it, just make sure you have an improof. See below for some examples.

Melmetal @ Leftovers
Ability: Prankster
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD
Relaxed Nature
IVs: 0 Spe
- Recover
- Haze
- Will-O-Wisp
- U-turn

Eternatus @ Rocky Helmet
Ability: Magic Bounce
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Scorching Sands
- Dynamax Cannon
- Recover
- Teleport
Say you want to use this Prankster Melmetal to check Physical Attackers like Zacian-C and Zekrom with Will-O-Wisp and serve as a slow pivot with U-turn. This set is fine at its job, but it lets Imposter get free recovery and a chance to burn you or pivot out, which can be a problem. Enter Eternatus, who with Magic Bounce can punish Imposter for trying to burn you and has a Rocky Helmet to chip its health if it U-turns and has Scorching Sands to punish it if it decides to stay in. While Imposter might get a chance to heal itself with Melmetal, using Eternatus as the improof allows you to be in charge and keep momentum since any move it makes can be taken advantage of in one way or another.

Eternatus @ Black Sludge
Ability: Fur Coat
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe
Bold Nature
IVs: 0 Atk
- Dynamax Cannon
- Teleport
- Recover
- Sludge Bomb

Magearna @ Metronome
Ability: Pixilate
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe
Calm Nature
IVs: 0 Atk
- Rapid Spin
- Boomburst
- Soft-Boiled
- Teleport
Eternatus is a great Fur Coat mon in the meta to help handle Physical Attackers but it is quite vulnerable to Imposter since it is 2HKOed by its own Dynamax Cannon. Having a teammate like Pixilate Magearna helps to ease dealing with Imposter of Eternatus thanks to Magearna being immune to both its STABs and racking up nice chip damage with strong Boombursts if Imposter tries to recover. The Metronome allows Magearna to out-damage the Imposter's recovery attempts after a couple turns.
The important takeaway here is that you can't always deny Imposter from using your walls but you can always punish it when it does.
Improofing Mons with RegenVest
Regenerator is a very useful ability in Balanced Hackmons and can become even more useful when combined with an Assault Vest. This helps your team check opposing Special Attackers all while getting healed up when you switch out. This sounds great, but Regenerator mons are basically a magnet for Imposter. Since Regen is normally used defensively, Imposter really benefits from switching into RegenVest users and taking advantage of its insane bulk and free recovery all while scouting your team. This sounds bad, but that doesn't mean you shouldn't use this ability. Here's an example of how to improof a RegenVest mon.

Zamazenta-Crowned @ Assault Vest
Ability: Regenerator
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Careful Nature
- Body Press
- Spectral Thief
- U-turn
- Nuzzle / Knock Off
Zama-C is a common user of RegenVest thanks to its neat typing and great 92/145/145 bulk. However, Imposter gets 250/145/145 bulk that is boosted by Eviolite and gets free healing. Running a set like this can be very useful for checking a myriad of Special Attackers but you can't let Imposter fully take advantage of you every time you use it. One way to do this is with your own moveset. Moves like Nuzzle and Knock Off are not only useful to cripple any opponent but also Imposter that comes in expecting free recovery. RegenVest mons can't be fully self-improof so you'll have to use a teammate that can punish Imposter. An example teammate that goes well with this Zama-C is shown below:

Zekrom @ Rocky Helmet
Ability: Fur Coat
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Impish Nature
- Glare
- Bolt Beak
- Recover
- Teleport
Using this Fur Coat Zekrom as a teammate helps improof Zama-C because Rocky Helmet cuts down on the recovery Imposter hopes to gain and Zekrom's typing helps to absorb attempted Nuzzles. The rest of Zekrom's moveset is not only relevant and viable for checking Physical Attackers but also is built to punish Imposter of Zama-C that greedily stay in to burn PP.
Improofing Offensive Mons with Offensive Teammates
This method of improofing is sometimes referred to as a "hard-improof" and is good for team builds that are offensively oriented. The idea is to use multiple offensive team members to put pressure on the opponent that also check each other's Imposters. This type of improofing often comes at the cost of running uncommon sets with the benefit of making Imposter useless to gain opportunities to setup or get momentum. See some examples below.

Zeraora @ Magnet
Ability: No Guard
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe
Naive Nature
- Zap Cannon
- Bolt Beak
- Dynamic Punch
- Shift Gear

Golurk @ Ghost Memory
Ability: Adaptability
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Jolly Nature
- Shift Gear
- Earthquake
- Multi-Attack
- Bolt Beak
:Gourgeist-Super:Gourgeist-Super @ Leftovers
Ability: Primordial Sea
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Impish Nature
- King's Shield
- Teleport
- Spectral Thief
- Recover

Darmanitan-Galar-Zen @ Ice Memory
Ability: Mold Breaker
EVs: 248 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Jolly Nature
- V-create
- Multi-Attack
- Bolt Beak / Shift Gear
- Close Combat
This example is a core I've used on an offensive team. It uses multiple team slots that all check one another while also pretty much shutting down Imposter. Zeraora kicks off the core by spamming high-powered Electric STAB and RNG thanks to No Guard and if Imposter comes in on it, you can switch straight to Golurk because Zeraora can't touch it. This gives Golurk a chance to setup and potentially get a kill. Golurk makes use of Ghost-Memory but running EQ means it isn't self-improof completely, so Gourgeist takes advantage of Imposter not holding a memory and its unique typing to resist Golurk's coverage. It can steal boosts with Spectral Thief or pivot out with Teleport for momentum. If Imposter comes in on Gourgeist, DGZ comes in to threaten it with Ice Multi-Attack and in return, your Gourgeist also improofs Imposters of the DGZ.