Mewtwo

Mewtwo is a Legendary Psychic-type Pokémon, created scientifically, based on the genetic code of another Legendary Pokémon, Mew. Due to constant experimentation (and its awareness of being an experiment), it went out of control and escaped. Among all the Pokémon that exist, Mewtwo has the most violent nature. Its first appearance was in Pokémon Red and Pokémon Blue. Mewtwo Mega Evolves into either Mega Mewtwo X or Mega Mewtwo Y in Pokémon X and Pokémon Y. It makes a playable appearance as a fighter in Super Smash Bros. Melee, and as an upcoming downloadable fighter in Super Smash Bros. for Nintendo 3DS / Wii U.

Super Smash Bros. series
Mewtwo was meant to be a playable character in Super Smash Bros., but time constraints posed as an issue, so it was left out.

Super Smash Bros. Melee
In Super Smash Bros. Melee, Mewtwo is an unlockable character. Mewtwo appears after the player has played a total of twenty hours of VS matches with one player, fifteen hours with two players, ten hours with three players, and five hours with four players. It then battles the match's winner; if the player defeats Mewtwo, it is playable from then on.

Mewtwo is a somewhat heavy character, but it has a high air jump (stemming from its Psychic abilities). Its attacks can be pretty powerful, but it is not very fast. Mewtwo also floats above the ground, making it an easy target to send flying and even KO at low damage percentages, and it also has low traction. Mewtwo also possesses a strong grab, and its throw moves pack a strong punch as well. Although these attributes make it difficult to control, Mewtwo is incredibly powerful once used correctly.

Mewtwo does not use its hands to hold items, using telekinetic powers instead, making the items hover before it. A similar style is seen when Mewtwo hangs on a cliff or grabs another character. The only time it does touch an item is when floating on the Parasol. Mewtwo is voiced by Masachika Ichimura in both English and Japanese.

Super Smash Bros. Brawl
Mewtwo is one of the five characters who did not return in Super Smash Bros. Brawl as a playable character (the other four being Dr. Mario, Young Link, Pichu, and Roy), possibly replaced by Lucario, a Pokémon with similar attacks. It is the only non-clone character to not return, although hackers have discovered data for it, meaning that at one point during development, it was intended to return. It does, however, have the appearance of a trophy, which can be obtained by completing All-Star Mode on Intense difficulty.

Super Smash Bros. for Wii U and 3DS
Mewtwo is confirmed to be downloadable DLC in Super Smash Bros. for Wii U and 3DS. He will come out in Spring 2015, and will be available for free to players who own both 3DS and Wii U versions of the game. Presumably, this implies he will cost money to those who don't own both versions.

Shadow Ball


Shadow Ball, a move from the Pokémon series, is Mewtwo's special move that is executed simply by pressing the B button. The Shadow Ball is in a way similar to Samus's Charge Shot. If done correctly, Mewtwo should start charging up a ball of dark matter in its hands. The player could hold the B button to charge it even more. One could even walk with it. Once charged enough, the player must either let go of the button (if charging it up), or press the B button (if walking around with it) in order to shoot it at the opponent. The more it is charged up, the slower it will move (and the slower it will bob up and down as it floats along); this means that while the attack is very powerful once charged up to the max, there is a good chance Mewtwo will miss the foe. Also, when shot at full power, the resulting shockwave pushes Mewtwo back a few feet. After the attack travels so far, it disappears. Kirby can also use Shadow Ball if he sucks up Mewtwo's power. When he copies it, however, because he is much shorter they will likely hit the ground unless Kirby is in the air.

Lucario possesses a similar move called the Aura Sphere in ''Super Smash Bros. Brawl.

Confusion



 * You may be looking for the "Confused" status effect from Paper Mario: The Thousand-Year Door.

Confusion is Mewtwo's side Special Move. If done correctly, Mewtwo will use psychic energy to flip any player in front of itself. This can be used to stop the opponent in their tracks if they are trying to attack or to distract the opponent so that Mewtwo can escape. Confusion can also be used to repel projectiles, like Link's Bow or Mario's Fireball. Also, Confusion is in fact one of Mewtwo's attacks from the Pokémon series. Oddly enough, even though this attack can repel projectiles, the projectiles can't hurt the attacker; for example, Mewtwo can't hurt Mario with his own fireballs.

Teleport
Teleport is both Mewtwo's Up + B Special and its third jump. This time, Mewtwo uses its Psychic abilities to teleport itself upwards into the sky. Once done, it will drop down onto the field. The attack doesn't do any damage and is merely a recovery move for when Mewtwo falls off the stage or needs to avoid a barrage of opponents. If this move ends in mid-air, Mewtwo will be put into a helpless state.

Disable


Disable is Mewtwo's last Special Move in Super Smash Bros. Melee. It is executed by pressing Down + B. Once performed correctly, it will make sparks come out of Mewtwo's eyes, and if they hit anybody, then the character becomes immobile in the same way as when a player's shield is broken. This leaves the opponent open for attack. However, the move will lose its effect after a period of time. Opponents can also snap out of the Disable if they are hit once. If Mewtwo does this move again if its target is immobile, then the target will be sent flying into the air, with only one damage made to them. The attack can also be used to help Mewtwo run away.

The move does have drawbacks, however. Disable is useless unless Mewtwo's target is facing it. Also, the move can be blocked, and even reflected, meaning that Mewtwo can become immobilized by its own attack.

In the Pokémon games, Disable does not stun the opponent but makes one of its moves temporarily unusable.

Trivia

 * Mewtwo never does speak when the language is set to English; it makes only grunts, sinister laughs, and other noises. It does speak telepathically on the results screen when the language is set to Japanese though.
 * When in metal form, Mewtwo does not make clanking noises, even when it lands.
 * Mewtwo's Pokédex entry states that it weighs 269 lbs. Despite this, it is lighter than Peach and Zelda in Super Smash Bros. Melee. Additionally, Mewtwo's weight is higher than that of all the playable Pokémon in Super Smash Bros. Brawl (none of them weighing more than 200 lbs.), but some of those Pokémon are heavier than Mario, who's heavier than Mewtwo in Super Smash Bros. Melee.
 * In "Challenger From the Shadows", a trailer for Super Smash Bros. for Nintendo 3DS / Wii U, Greninja's silhouette looks slightly similar to Mewtwo.