How to get it
- Complete research that explicitly awards a Master Ball. Availability and claim windows depend on the research release.
- There is no ordinary PokéStop or Gift farming method.
How to use it
- Choose the Master Ball from the encounter ball menu and confirm the decision.
- Check the Pokémon and encounter before confirming: using the ball consumes it.
Worth knowing
A rare fleeing wild Pokémon or a prized raid catch on its final ball can justify using one.
A guaranteed catch does not improve the Pokémon’s IVs, level, or Shiny status. Those traits already belong to the encounter.
Sources & further reading
- Pokémon GO: A Quantitative Approach by nick blackVersion 1.0.6 (October 4, 2026), §5.2, p. 30; §9.3, p. 120
Event rewards, shop offers, and limits can change. Check the current in-game description for event-specific rules. Worked examples are illustrative calculations.
