Mew

Mew (Japanese: ミュウ, Myū) is one of the Pokémon found in the Pokémon media franchise. It has appeared as a very rare Pokémon in each Smash-game, and the rarity depends on the number of revealed Pokémon during each games release; 1/151 in Smash Bros., 1/251 in Melee, and 1/493 in Brawl.

This is a Poké Ball Pokémon that appears in all three Smash Bros. games, which is a rarity, because the only other known such Pokémon are Electrode*, Goldeen, Snorlax, and Charizard**.

* Electrode doesn't appear from a Poké Ball in Super Smash Bros., but rather as a stage hazard in Saffron City.

** Charizard appears in all three, it makes its debut as a playable character in Brawl instead of coming out of a Poké Ball item.

As a Poké Ball Pokémon
Mew makes its first appearance in Super Smash Bros.. It doesn't attack, but will instead remain on the screen for a few seconds, then fly off. It can be completely unnoticed when it comes out of a Poké Ball if the fighting is intense, since it doesn't harm anyone. Mew's appearance is rare since it is a legendary Pokémon. The summoner of Mew is awarded the Mew Catcher, worth 10,000 points. Mew has a 1/151 chance of appearing in this game. 151 happens to be the total number of Pokémon at the time when Super Smash Bros. came out.

As a Poké Ball Pokémon
Mew reappears in Super Smash Bros. Melee, again flying off instead of attacking. The only difference in the "attack" is that Mew appears in its bubble. No character is harmed by Mew's "attack" in Melee either. Mew can only be seen if all characters are unlocked. This makes Mew one of only two unlockable Pokémon in Melee, the other being Celebi. Both have a 1/251 chance of appearing in this game. 251 happens to be the total number of Pokémon at the time when Melee came out. The first time the players see a Mew, they will get a notice saying that it was their first time seeing it.

As a trophy
Mew is featured as a collectible trophy; this trophy must be specifically earned by playing Hard or Very Hard in All-Star Mode to unlock the trophy. Continuing is allowed to get this trophy.

Trophy description in Melee

 * Mew is an extremely rare Pokémon that has been seen by only a few people. Information on every Pokémon in the world is contained in Mew's cell structure, so it has the ability to use any and all TMs and HMs. Some Pokémon scholars believe Mew to be the ancestor of all existing Pokémon, but the idea is debatable.

As a Poké Ball Pokémon
Mew returns yet again in the third installment. This time though, it drops a CD. It is the most uncommon of all the Pokémon in the game. After the first time brawlers see it, they get a notice saying that it was their first time: "You've encountered Mew for the first time. Strange things do happen."

Mew appears at a rate of 1/493. 493 happens to be the total number of Pokémon as of Diamond and Pearl, including Arceus, who hadn't even officially been revealed by Nintendo yet when Brawl came out.

If the player has collected all of the CDs, Mew will drop stickers instead, like Jirachi.

As a Trophy
Mew also returns as a collectible trophy, though unlike in Melee, the Mew trophy is found randomly, either by obtaining it in the Coin Launcher, or finding it in Subspace Emissary.

Trophy Description in Brawl

 * A New Species Pokémon. An extremely rare Pokémon that contains the DNA of all other Pokémon, it is thought by many scholars to be a Pokémon ancestor, considering the wide range of moves it can use. On top of being able to make itself invisible, Mew can also transform into any opponent Pokémon and use characteristics and moves in exactly the same way."


 * Pokémon Red/Blue
 * Pokémon Diamond/Pearl