Pokémon Trainer calls out all three of his Pokémon to perform a synchronized team attack. Squirtle uses Hydro Pump, a multi-directional spray of water. Ivysaur uses Solar Beam, a narrow beam of concentrated light, to create a wide projectile that holds targets in place. Charizard uses Fire Blast, firing six large star-shaped flames that also act as the move's finishing blow. Once the attack has ended, Pokémon Trainer recalls the two inactive Pokémon, and the Final Smash ends.
During Triple Finish, Pokémon Trainer shouts, "Take this! Triple Finish!" with an accompanying dialogue box (that incorrectly reads "Take that!" instead of "Take this!") like in the Pokémon games. If the move successfully damages an opponent, the text changes to "It's super effective!" The text box hides damage meters and appears in Snapshots. The camera zooms in on the trio at the start of the move, zooming out as it progresses.
The move does more damage to opponents that are closer to the Pokémon, where they can take up to 57% damage. However, if the opponent is too close, they will be sent straight up and out of the attack by a concentrated ball of energy in front of the Pokémon. It can also be used in mid-air.
In Super Smash Bros. Ultimate, the female Pokémon Trainer says "Go! Triple Finish!", while the male Pokémon Trainer now properly says "Take that! Triple Finish!". The second message, "It's super effective!", shows regardless of whether the attack hits any opponents. Also, Charizard fires five Fire Blasts instead of six. Squirtle's Hydro Pump has been reworked into a whirlpool.
During the attack, all three Pokémon will have glowing yellow eyes, but the one active in the battle will retain its glowing Final Smash aura.
The Final Smash of the Pokémon Trainer. Squirtle, Ivysaur, and Charizard join forces to simultaneously use Hydro Pump, SolarBeam, and Fire Blast. This is the only time all three of them appear on the screen together, so this move boasts the strength of three in one. A window will appear on the screen, but don't worry about it.
All three of the attacks used in this Final Smash, Hydro Pump, Solar Beam and Fire Blast, have featured in every main installment in the Pokémon franchise. Prior to Generation III, these moves were known for being the strongest moves of their types (Water, Grass, and Fire respectively). They are each Special moves with a very high base power of 110 (120 for Solar Beam and prior to Generation VI), but Hydro Pump and Fire Blast have low accuracy values (80% and 85%, respectively), and Solar Beam requires a full turn to charge.
The concept of three Pokémon being active at once was not possible in the Pokémon series at the time of Brawl's release. However, Triple Battle were introduced in the Pokémon series in Generation V, where each Trainer sends out three Pokémon at once. An episode of the Pokémon anime prior to Brawl featured the first non-official Triple Battle in the series.
The text box that appears resembles the ones that appear during battles in the Pokémon series, describing what actions are taken and their effects. The style of the text box resembles the latest installment of the series in each game the move is featured in: Diamond & Pearl in Brawl and Sun & Moon in Ultimate. However, neither of those two sets of games features Triple Battles.
The phrase "It's super effective!" is used when the type of a move used by a Pokémon is strong against the type of the opposing Pokémon (for example, a Fire-type move against a Grass-type Pokémon). In these instances, the attack will deal double or quadruple (if the target Pokémon has two types with the same weakness) the normal amount of damage, and is accompanied by a different damage sound effect.