Ditto

Ditto (, Metamon), is a creature from the series.

Origin
Ditto is a Normal-type Pokémon introduced in, and is categorized within the Pokédex at #132 as the "Transform Pokémon". Its only move in every game is which allows it to turn into a copy of its opponent, though while keeping its own original HP. The effect disappears when switching out or finishing the battle. In it received the , which makes it transform automatically upon entering the battle.

While Ditto copies the Pokémon's actual coloring in onwards, the purple coloring of the copied fighter in Ultimate pulls from Ditto's appearance in, where it would transform into a purple copy of the opposing Pokémon. This also applies to Generation I when played on a Super Game Boy.

As a Poké Ball Pokémon
Ditto is a Pokémon that was removed from Super Smash Bros. Melee just prior to its release. Its purpose was to create an AI copy of the user's character, which would aid them in battle. Ditto has an entry in the game's official strategy guide despite this, suggesting that it was a late cut to Melee.

Ditto can still be accessed using the through an Action Replay, where it is known internally as METAMON. When summoned from a Poké Ball, it says "Mon-mon!" and stretches out while spinning, then disappears. Fighters that touch Ditto while it spins get around 7-8% damage, with weak knockback. Its voice clip is from the Japanese version of Pokémon anime episode 37.

As a Tournament Mode element
In, in either Winner Out or Loser Out style tournaments, when selecting a character for these events, the player can hold down L+R and then press A to select a random character. The character will appear as Ditto and will be a random character and color when each match begins.

Trophy
Ditto is featured as a collectible trophy, randomly obtained in the Trophy Lottery.

In Super Smash Bros. Brawl
Ditto is mentioned in Manaphy's trophy description.

As a Poké Ball Pokémon
Ditto will transform into the fighter who threw the Poké Ball when joining the fight. After the transformation, Ditto will have the exact same abilities as the original fighter! Ditto was confirmed in the August Nintendo Direct to appear as a Poké Ball Pokémon. When it appears, it will into a purple version of the summoning fighter, acting as a CPU player and taking their physical appearance, with the only difference being a purple gelatinous texture. Players and Assist Trophies alike can attack the clone. Ditto can be defeated, but doing so will not score a point. It is also the only Poké Ball Pokémon in the game who can be defeated. The AI for Ditto appears to be comparable to a low-level regular CPU, often standing still for periods of time and attempting individual attacks only, much like the behaviour of many other Poké Ball Pokémon. It also takes more knockback than regular fighters. However, its attacks deal 1.1× regular damage to compensate. It cannot be summoned during an 8-Player match but it still can be summoned with 7 players or lower.

While Ditto will exactly copy most characters exactly like how they are originally (minus the purple gelatinous texture), the following copies will be different:
 * If the summoner plays as the, it will only Transform into the leading Ice Climber.
 * If the summoner is playing as, the copy will not have a Luma.
 * If the summoner is playing as 's Pokémon, it'll Transform into whichever Pokémon summoned it, and will not copy the actual Pokémon Trainer, nor will it Transform again if the current Pokémon is switched out.
 * If Ditto Transforms into, it will spawn with a red, yellow and blue Pikmin, rather than which Pikmin are currently being used.
 * If Ditto copies or, it will not transform into the other character with Swap.
 * If with a Copy Ability is the summoner, Ditto will not have the copy ability. However, it can swallow enemies to gain their copy ability. Ditto can be swallowed by an enemy Kirby in order to get the Copy ability of the character which Ditto is transformed into.

Additionally, if Ditto Transforms into, the Ditto will also copy its Aura effect, and copying s will include the Mii's current moveset. When it copies a crafting table will appear for the Ditto.

If spirits are enabled, Ditto will only have the primary spirit effects, but like other Poké Ball Pokémon, its stats are affected by the summoner's spirit team.

Trivia

 * Much like when a character is under the effect of Metal Box or turned gold, Ditto only copies bump maps of the character models. As a result, several visual differences are present compared to the summoner, such as not having visible eyes.
 * Ditto is the first Poké Ball Pokémon since Cyndaquil, Chansey and Marill in Melee that can be defeated. It is also the only assist character that can be hit by cinematic Final Smashes.
 * If Ditto gets all the pieces of a Dragoon, it will target the reticle at an opponent, but will not manually use it and wait until it is fired automatically.
 * If Ditto is present when the battle ends, it will vanish when "GAME" is on the screen, unless it is not transformed.
 * Normally, Ditto is silent after transforming into a duplicate of its summoner. However, if certain Final Smashes are activated, it will use the summoner's voice clips (if applicable) after the Final Smash successfully connects against any opponent, as opposed to its own voice that it makes once initially summoned.
 * When Ditto gets summoned by a player currently using a name, the name indicator will be missing the bordered background, but when it transforms into the character who summoned it, the border will appear. However, it vanishes once Ditto returns to normal.