"No matter how strong you become, never seek to bear everything alone. If you do, failure is certain."
― Itachi Uchiha (Naruto)
"Hot damn! Those two are seriously on a whole new level when you put them side by side!!"
― Den Ei on his captain, Shin of the Hi Shin Unit and Ou Hon of the Gyoku Hou Unit (Kingdom)
"The strength of being in a group is the ability to make up for individual deficiencies which results in greater collective strength."
― Tatsumi Kotaro (Zombie Land Saga)
Team Combinations are techniques that are created by two or more people to take out a very powerful force or a large group that one cannot do alone.
The users can combine their strengths to form powerful attacks against common adversaries. For example, if someone with Electric Manipulation combines an attack with someone that used an attack with Water Manipulation. Not only do they do more damage than their attacks alone, but most likely be done at a bigger radius to take out more foes.
Super-powered teams are not just for battle, some power combinations can save someone or some people for certain doom. An example would be when someone with Magnetism Manipulation and someone with Telekinesis lifts a heavy metal object that neither could do alone to give people time to escape from harm's way.
Some team combinations are usually done by teams or crew, but they are more effective if the users practice enough.
Unfortunately, some combinations are ineffective against a certain being or fail to take out the whole army if the wrong power(s) are used.
Various Characters (Dragon Ball series); via Fusion techniques
Trio De Dangers (Dragon Ball Super)
Pride Troopers (Dragon Ball Super)
Kamikaze Fireballs (Dragon Ball Super)
Demon Slayers (Demon Slayer: Kimetsu no Yaiba)
Guilds (Fairy Tail)
Various Characters (Fairy Tail); via Unison Raid
Gundam Pilots (Gundam series)
3-man Squads (Naruto)
Ay/A and Killer Bee/B (Naruto)
Shinobi Alliance (Naruto)
Gi Users (Netoge no Yome wa Onna no Ko Janai to Omotta?)
Straw Hat Pirates (One Piece)
Vinsmoke Brothers (One Piece)
Precures (Precure Series)
Mizore Shirayuki and Kurumu Kurono (Rosario + Vampire)
Sailor Soldiers/Scouts (Sailor Moon)
Four Heavenly Kings (Toriko)
Witches 5 (Sailor Moon)
Negamoon Sisters (Sailor Moon)
Doom and Gloom Girls (Sailor Moon)
Ou Hon (Kingdom)
Ba Nan Ji (Kingdom)
Kazuma Kuwabara (Yu Yu Hakusho)
Yusuke Urameshi (Yu Yu Hakusho)
League of Villains (My Hero Academia)
Dark Warlords (Ronin Warriors)
Aogiri Tree (Tokyo Ghoul)
Users of Double and Triple Techs (Chrono Cross/Trigger)
Ice Climbers (Ice Climbers)
Several characters (Kingdom Hearts)
Seekers of Truth (Person 4 and Golden)
Pokémon (Pokémon); via Water Pledge, Fire Pledge and/or Grass Pledge, or via Fusion Bolt and Fusion Flare, or via Beat Up
Sonic and the Wisps (Sonic the Hedgehog series)
Teams (Sonic the Hedgehog series)
Sanger Zonvolt and Elzam von Branstein (Super Robot Wars); when piloting Dygenguard and Aussenseiter respectively
Jude, Milla, and their allies (Tales of Xillia)
Mario and Luigi (Mario & Luigi series)
Arachnos (City of Heroes)
Robot Masters (Mega Man)
Mavericks (Mega Man)
Stardroids (Mega Man)
Dark Purveyors (Lollipop Chainsaw)
Deadly Six (Sonic Lost World)
Doom Raiders (Skylanders)
Evil Syndicate (Nicktoons Unite! and Nicktoons: Globs of Doom)
Doom Syndicate (Megamind: video Game)
Council of Disney Villains (Kingdom Hearts)
L.E.G.I.O.N. (Agents of Mayhem)
Fiendish Five (Sly Cooper)
Wrecking Crew (Rampage)
Banjo & Kazooie (Banjo-Kazooie)
Popple with Bowser or Birdo (Mario & Luigi: Super Star Saga)
Whenever Mane Six (My Little Pony: Friendship is Magic) are together with their Elements of Harmony, they are able to combine their magic in order to banish or imprison anything that may prove as a threat to Equestria.
The Powerpuff Girls (The Powerpuff Girls)
Steven Universe and Connie Maheswaran (Steven Universe) have been proven to make an excellent tag-team, Connie dealing offense and Steven defense.
The Winx Club (Winx Club) perform Convergence.
Dark Turtles (Teenage Mutant Ninja Turtles)
COBRA (G.I. Joe)
The Trix (Winx Club)
Knights of Vengeance (W.I.T.C.H.)
Nightsisters (Star Wars)
April Moon Gang (Batman Beyond)
Meta-Bredd (Static Shock)
The Vexicons (Mysticons)
Rengades (Challenge of the GoBots)
Evil Warriors (Masters of the Universe)
Evil Horde (Masters of the Universe)
Faculty 4 (Codename: Kids Next Door)
Mon*Star's Mob (Silverhawks)
Monster Trio (Ben 10)
Raptors (Extreme Dinsoaurs)
Injustice League of America (Dynomutt, Dog Wonder)
Injustice Freiends (Dexter's Laboratory)
Council of Doom (Space Ghost)
Eco-Villains (Captain Planet and the Planeteers)
Daughters of Aku (Samurai Jack)
Sons of Garmadon (Ninjago)
Savanti Romero's Monster Army (Teenage Mutant Ninja Turtles)
Darkling Lords (Visionaries: Knights of the Magical Light)
Gangreen Gang (Powerpuff Girls)
Legion of Low Tide (Sushi Pack)
The Organization for Generally Rotten Enterprises/OGRE (Drak Pack)
Fearsome Five (Darkwing Ducks)
S.K.A.R. (G.I. Joe Extreme)
Monster GoBots (Challenge of the GoBots)
Jurassic Creeps (The Grim Adventures of Billy & Mandy)
S.P.H.I.N.X. (The Venture Bros.)
Doom Factory (The Venture Bros.)
LOSE (League of Super Evil)
Saurians (The Mighty Ducks)
Flex Fighters (Stretch Armstrong and the Flex Fighters)
Monster Minds (Jayce and the Wheeled Warriors).
LAMOS (Totally Spies).
Sisterhood (Totally Spies).
White Shadow Organization (Minoriteam)
L.O.V.E. and H.A.T.E. (The Life and Times of Juniper Lee)