While it's a surefire way to catch it, you can also catch Cresselia using the traditional methods:
* Weakening Cresselia: This involves lowering its HP with attacks, making it easier to catch.
* Status Conditions: Applying status conditions like Sleep, Paralysis, or Freeze can further decrease its catch rate.
* Using Poké Balls: Higher-tier Poké Balls, like Ultra Balls or Great Balls, increase your chances of catching Cresselia.
* Having high catch rate bonuses: Certain items like the Catching Charm or being at a higher friendship level with your Pokémon can improve your catch rate.
Important Note: Cresselia's catch rate is notoriously low, so catching it even with the above methods can be challenging. But with patience and strategy, it's definitely possible without relying on a Master Ball!