Pelican Island is the second stage in Sub-chapter 17, Alcatraz.
If you have trouble inflicting damage on Master A., it's a sign that you need true form cats. As with any other Master A. strategy, Unknown Cat can greatly help.
Master A has a magnification of 400%. Also beware of the peons. Duche and Otta-smack-u are all 400%, so they may plow through your lines easily. They lack the "color" type, so don't bring special affect cats. Bahamut can't hit the Master A. even once, so don't bring him. If you have the true form of Valkyrie, bring her.
Cat Line Up (Important Cats are in Bold Font) : Crazed Macho, Crazed Wall, Crazed Brave, Macho Legs, Crazed Sexy Legs, Valkyrie, King Dragon, Crazed Dragon, Jamiera Cat, Crazed Titan Cat, Crazed Whale Cat.
Try to take out the otters and ducks as fast as you can. Once no peons are in your way, fire the cat cannon and spam the bold-fonted Cats. Repeat.