Master Ball

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 Red
Red received his Master Ball after he defeated Giovanni at Silph Co. He later used it to capture the Zapdos at the Power Plant.

Twitch Plays Pokemon Crystal
AJ received his Master Ball from Professor Elm after he won his eight badge. He used it on a Goldeen in Tojoh Falls.

Twitch Plays Pokemon Emerald
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 FireRed
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 Platinum
Napoleon used the Master Ball on a wild Geodude.

Twitch Plays Pokémon HeartGold
Aoooo received her Master Ball from Professor Elm after winning eight badges. She used it on a Cranidos.

Twitch Plays Pokémon Black
Jimmy used the Master Ball on a Vullaby.

Twitch Plays Pokémon Omega Ruby
Arty Haze obtained the Master Ball from Team Magma's base and used it to capture Azelf.

Anniversary Pokemon Red
Abe once again received his Master Ball after defeating Giovanni at Silph Co at 16d 21h 19m 12s. Like his predecessor, Abe too used it to capture Zapdos at the Power Plant.

Touhoumon
In keeping with the renaming theme, the Master Ball was renamed the Lunatic Orb. Abraham used it to capture Mima at the peak of Mt. Ember.

Moemon
Athena used the Master Ball to capture an Ekans.

Twitch Plays Randomized Alpha Sapphire
The Master Ball was tossed.

Twitch Plays Pokémon Colosseum
The Master Ball was used to snag Mistress Absol.

Twitch Plays Pokémon XD
The Master Ball was used to snag Mistress Poliwrath.

Anniversary Crystal
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.