Yes, There Are Master Balls in Pokemon Go

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Pokemon Pokeball Master Ball Splitted

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What is a Master Ball in Pokemon GO? - Playbite

Is 'Pokémon GO' Pay-To-Win? Yes And No

Pokemon GO: How To Get and Use Master Ball

pokémon: Pokémon Scarlet and Violet: Here's How You Can Get A Free Master Ball - The Economic Times

Master Ball research: or as I like to call it: eff off you effing casuals!! : r/pokemongo

Can You Get a Second Master Ball in Pokemon GO? - Playbite

What are the different types of items available in Pokemon GO, and how do they enhance gameplay? - Quora