Our group of heroes are fighting against the Psycho Rangers, Evil Twins or opponents skilled or specialized against certain techniques against them, individually, fighting to, at best, a stalemate. One of the heroes realizes it's futile fighting against their equal, so all of them switch opponents, which wins them the battle. For some reason this almost never leads to Evil Twin A being defeated by Twin B but Evil Twin B defeating Twin A, as might be expected if they're actual equal to their doubles, nor the evil ones winning due to the change. There just seems to be some rule that switching opponents automatically guarantees heroic victory, even if it doesn't make sense. A common subversion of the Plot Tailored to the Party. May be justified in that the villans use techniques that are only useful against their chosen enemy, meaning they would be useless against anyone else. Another justification that makes more sense is that the heroes don't know their own weaknesses as well as they know those of their teammates, so when they switch, their teammates know the weaknesses of their teammate and thus the Evil Twin they're up against and can thus defeat them.
Compare Counterpart Combat Coordination and Midfight Weapon Exchange.
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Bleach: Uryu and Chad switch opponents in their first battle in Hueco Mundo and successfully defeat them. Note that it also went in an opposite direction: initially, the speedy archer Uryu was fighting against a giant and The Big Guy Chad has been fighting against a fast shooting Arrancar. Then they switched toMirror Match of sorts, by fighting opponents strong in the same fields as they - and completely overwhelmed them.
Medaka Box: Medaka, Zenkichi, Kumagawa, and Ajimu were stalemated by their respective doubles. The answer? Have Medaka defeat Zenkichi's double, Zenkichi beat Kumagawa's, Kumagawa beat Ajimu, and have Ajimu defeat Medaka.
This happens a few times in the Enies Lobby arc of One Piece. Nami gets Kumadori's key but is unable to defeat him due to his superior strength and close to medium range fighting, resulting in Chopper stepping in to help. Sanji is stronger than Kalifa but is unable to hit a girl, and after his defeat, Nami saves him, winning because she can counter Kalifa's bubble powers with her Clima-tact. Usopp is not strong enough to defeat Jyabura, so Sanji steps in while telling Usopp to go save Robin, defeating Jyabura with his ability to break through his specialized tekkai. Usopp manages to snipe Spandam and the guards from a distance, something no one else could do. Only Zoro and Franky end up defeating their original opponents; Kaku was, like Zoro, also a swordsman, but Fukurou relied on speed and hand-to-hand combat, in contrast to Franky's mix of close quarters and ranged attacks.
A backup story in Peter Porker, the Spectacular Spider-Ham has the Fantastic Fur meet an evil set of themselves, and they predictably go after their doppelgangers as per usual. Then the Reed Richards says that they should change opponents — so the Thing fights the Invisible Girl and Reed fights the Torch — then the Thing gets an idea... rather than fighting each other, they should fight the bad guy versions of themselves.
This is actually used quite often in comic books. For example, the Fantastic Four did the same trick decades earlier than the above Peter Porker example in one of the Silver Age Galactus stories, and in another Silver Age story involving robot doubles fighting them.
Inverted in another early story when they were up against elemental constructs. The elementals were under strict instructions from their creator to avoid going up against their opposite numbers (Reed/Water, Sue/Air, Thing/Earth, Torch/Fire) and each ends up being defeated by its counterpart.
This was part of the premise of the Marvel Comics crossover Acts of Vengeance.
This happened in one issue of Archie's Sonic the Hedgehog, where Sonic and the Freedom Fighters fight their evil mirror universe doppelgangers.
Subverted in Sonic the Hedgehog/Mega Man: Worlds Collide. Mega Man and Sonic are fighting Bass and Metal Sonic respectively in a stalemate. When the heroes decide to switch (thinking that their knockoffs are only programmed to beat their counterparts), they get overwhelmed instead. They decide to team up against one at a time to beat their evil doubles.
Mega Man: "Works every time", huh?
Sonic: Oh, cute, you were programmed with sarcasm.
When the Thunderbolts were ordered by the government to rough up the New Avengers (who were looking into things they didn't like), the Avengers tried to do this, only to find out the Thunderbolts had predicted it.
Runaways does this during the final fight of the first volume, when the kids confront their parents. Gert's dinosaur companion Old Lace is incapable of attacking any of her family, and Karolina's family's powers don't work on each other. "Ready... set... switch!"
The X-Men do this in The Dark Phoenix Saga. Colossus, Storm and Wolverine find themselves facing three of the Hellfire Club's Elite Mooks with power armors customized for their individual powers. Switching things up works nicely.
In the original Young Justice comic, they're up against fake nemeses; Robin versus Joker, Superboy versus Metallo, Impulse versus Grodd. Robin works out that they need to switch. He beats Metallo, Superboy beats Grodd, and Impulse...is so annoying that he drives The Joker nuts with frustration.
In Superman/BatmanPublic Enemies, Superman and Batman attempt this when Captain Marvel and Hawkman fight them. It doesn't work since Marvel and Hawkman expected it and each was prepared to fight either opponent anyway. Hawkman used a special gauntlet to hit Superman hard enough that even he would be knocked out, and Marvel exploited Batman's soft spot for kids by briefly reverting to Billy Batson. Superman and Batman beat them off-screen later.
My Little Avengers: Pops up during the Final Battle. Except for Big Mac, who goes after Loki in order to reclaim Thor's powers, the rest of the Avengers switch which of the Dark Avengers they take on. This is due to the fact that during their previous encounter, the Dark Avengers were able to curb-stomp them.
In a rare villainous version, Team Probable did this against Team Possible with Rhonda fighting Kim and Grimm fighting Ron. Unfortunately for the heroes, it worked.
Denji Sentai Megaranger/Power Rangers in Space did this with the Nejirangers / the original Psycho Rangers. To elaborate: each Psycho Ranger had absorbed the fighting knowledge of his/her opposing Power Ranger, and was thus able to properly defend and retaliate. At first, the Power Rangers did the normal "switch opponents" variant, but since the rangers were Color-Coded for Your Convenience, the Psychos just found their Rangers again and switched back. Then the Power Rangers went in all dressed like the Blue Ranger...
BIONICLE: How the Toa Mata defeated their shadow counterparts in Tales of the Masks. The encyclopedia Ret Conned it, however — in the new version, the Toa understand that the Shadow Toa were actually their inner evil, and reabsorb them by accepting it.
Each year there were also frequently sets of enemies who were similarly color coded, such as the Bohrok, the Rahkshi, the Vahki and so on. However the Toa didn't generally express any particular desire to specifically go after their same color.
Champions supplement Red Doom. One of the Supreme Soviets' standard combat maneuvers was "Soccer Ball", in which the team members switched opponents until they found one that was vulnerable to their attacks.
Subverted in The Order of the Stick. When the Linear Guild is failing to make progress against the Order, Nale suggests to Thog that they trade opponents. This actually makes things worse, as Elan's normally useless bardic magic is effective against Thog, and Roy has been holding back a strong urge to beat the tar out of Nale's twin brother Elan for quite some time.
The Linear Guild strikes again much later. With Roy getting the tar kicked out of him by Thog, Elan fleeing Nale, and V unable to get through Zz'dtri's magical defences, V then realises that Zz'dtri's achilles heel is best countered by someone else and invokes this trope - by using the Guild's own archer specialist, to boot.
"Ayla and the Great Shoulder Angel Conspiracy" in the Whateley Universe: when fighting New Olympians best suited to combatting them (even Person of Mass Destruction Tennyo), Team Kimba manages to trade opponents one by one until they defeat enough opponents that they can double-team the last couple.
Happens in Xiaolin Showdown, when a Sheng Gong Wu creates physical manifestations of each warrior's worst fear.
Teen Titans: Cyborg, Beast Boy, and Starfire fight against their Psycho Rangers counterparts, switching in the end to defeat them (Starfire to Evil Cyborg, Beast Boy to Evil Starfire, and Cyborg to Evil Beast Boy).
Cyborg: Told you I could kick your butt.
In the Fox series, the X-Men once fought their evenly-matched counterparts in X-Factor until Beast suggested they switch.
One episode of of the 2003 Teenage Mutant Ninja Turtles had Baxter Stockman create a Turtle Robot that scanned each of the TMNT as they went to attack it, once scanned the robot could replicate their weapons and fighting style, which worked, until the TMNT switched weapons with each other.
Inverted in an episode of The Powerpuff Girls where three crooks dress up as the Powerpuff Girls. When the Girls and the crooks throw down, both sides end up attacking their teammates by mistake before Blossom says they should just fight their counterparts to keep things simple. The whole episode is taken into Refuge in Audacity territory because the crooks' disguises are blatantly obvious to the viewernote as in, grown men wearing giant plastic "heads" and dresses and yet everyone including the real Powerpuff Girls and the crooks still confuses them for the real thing.
The Reboot Episode "Wizards Warriors and a Word From Our Sponsors" has Bob, Dot, Enzo and Mike the TV fight off their evil doppelgangers in a fantasy game. It doesn't go well until Mike inadvertently switches opponents by bumping into Evil Dot (who runs screaming from Mike's incessant infomercials).
This is how Spider-Man and his teammates defeat the Sinister Six for the first time in Ultimate Spider-Man. Kinda weird, considering that unlike usual examples, the Sinister Six are notThe Psycho Rangers, but villains who have nothing to do with the team, and yet each one of them get Curb Stomp. Including those like Beetle, Kraven, and Electro, would could give the entire team a hard time...
The Hercules and Aladdin crossover "Hercules and the Arabian Night" had Hades and Jafar team up. They decide to take on each other's enemy. Jafar says Hercules should be easy for him because Hercules isn't very agile nor clever, and Hades thinks Aladdin is worthless because he doesn't have Super Strength. The heroes defeat them anyway. Afterwards, the villains try Plan B: Let's You and Him Fight.