Best Overall:
* Ultra Ball: Generally the most effective ball, providing a good balance of catch rate and bonus.
For Increased Catch Rate:
* Premier Ball: Earned by winning a Raid Battle. Offers a significant catch rate bonus, especially against Legendary Pokémon like Lugia.
* Great Ball: A good option if you're aiming for a high catch rate but don't have a Premier Ball.
For Catching Difficult Lugia:
* Golden Razz Berry: The best berry to significantly increase your catch rate.
* Silver Pinap Berry: If you want more candy, this berry will double the amount you receive upon a successful catch.
For Advanced Players:
* Curveball: Throwing a curveball provides a slight bonus to your catch rate.
* Excellent Throw: Landing a perfect "Excellent" throw provides the highest bonus to your catch rate.
Important Considerations:
* Lugia's Catch Rate: This is a base value and can't be changed.
* Your Throw Bonus: Factors like Curveballs, Great Throws, and Excellent Throws increase your catch rate.
* Berry Usage: Golden Razz Berries provide the greatest catch rate bonus.
* Ball Bonuses: Premier Balls offer significant bonuses for Raid Battles.
Conclusion:
While there isn't a single "best" ball, the most effective approach involves using a combination of techniques and strategies. Aim for Premier Balls when possible, use Golden Razz Berries, practice Curveballs and strive for "Excellent" throws to maximize your chances of catching Lugia!