My sister is catching it, she says "I wonder if a dive ball will work on Lugia?" It's under water so oes it work?
The reason why is because the Dive Ball works on Pokemon that live underwater, and only Pokemon that live underwater. The battle with Lugia is in a mystical pink (yay, pink) field, not underwater, so technically, it will not be as effective to use a Dive Ball. Source: http://pokemondb.net/item/dive-ball