Reasons to use a Master Ball on Darkrai:
* Guaranteed capture: The Master Ball is the only Poké Ball with a 100% catch rate, ensuring you won't miss out on capturing Darkrai.
* Rarity and value: Darkrai is a legendary Pokémon with a limited availability, making it a highly sought-after Pokémon.
* Competitive battling: Darkrai is a powerful competitive Pokémon, and having a perfect IV and nature one can be valuable for competitive battling.
* Shiny hunting: If you're attempting to shiny hunt Darkrai, using a Master Ball can save you time and frustration if you encounter a shiny.
Reasons to not use a Master Ball on Darkrai:
* Limited resources: Master Balls are extremely rare items, and using one on a single Pokémon may feel like a waste of such a valuable resource.
* Challenge and satisfaction: Using other Poké Balls and strategies to catch Darkrai can provide a sense of achievement and satisfaction.
* Potential for other valuable catches: You might encounter other legendary or rare Pokémon in the future, and you may want to save your Master Ball for a Pokémon that is even harder to catch.
* Gameplay experience: Using Master Balls can make catching Pokémon too easy, potentially diminishing the enjoyment of the game.
Ultimately, the decision is yours. If you're willing to risk it, using a regular Poké Ball or other specialized Poké Balls with a higher catch rate can be more rewarding. However, if you prioritize guaranteed capture and don't want to risk missing out on Darkrai, then using a Master Ball is the most reliable option.