The Master Ball is a rare and special Poke Ball, in which guarantees the capture of any Pokémon it's used on (excluding the ghost Marowak and and Kyurem while it is under Ghetsis's control).
Originally developed by Silph Co., the prototype attracted Team Rocket's attention and caused them to put Saffron City under siege. After Giovanni was defeated, the president decided to give the Pokéball away to the youth who saved him and discontinued production. It is unknown whether they later restarted production or if another company started producing Master Balls instead.
Twitch Plays Pokemon RedEdit
Twitch Plays Pokemon CrystalEdit
Twitch Plays Pokemon EmeraldEdit
A obtained the Master Ball from Team Aqua's base, then wasted it on an Aqua Grunt's Zubat nine minutes later.
Twitch Plays Pokémon FireRedEdit
Alice obtained her Master Ball after defeating Giovanni at Silph Co., as Red did before her. Four hours later she attempted to use it to capture a trainer's Wingull.
Twitch Plays Pokémon PlatinumEdit
Napoleon used the Master Ball on a wild Geodude.
Twitch Plays Pokémon HeartGoldEdit
Twitch Plays Pokémon BlackEdit
Jimmy used the Master Ball on a Vullaby.
Twitch Plays Pokémon Omega RubyEdit
Arty Haze obtained the Master Ball from Team Magma's base and used it to capture Azelf.
Anniversary Pokemon RedEdit
Athena used the Master Ball to capture an Ekans.
Twitch Plays Randomized Alpha SapphireEdit
The Master Ball was tossed.
Twitch Plays Pokémon ColosseumEdit
The Master Ball was used to snag Mistress Absol.
Twitch Plays Pokémon XDEdit
The Master Ball was used to snag Mistress Poliwrath.
Evan has obtained 4 Master Balls so far, one from Professor Elm and the other bought from a store. The first Master Ball was used to capture Snorlax, the second to capture Entei, the third one was used to capture Raikou, and the fourth was to capture '--- ' the Mewtwo believed to the clone of the Mew named '-----' from the same game.