Captain Red Beard has been defeated but he's not giving up yet. He runs to Western Cobalt Plateaus with Bomb's ship's steering wheel in his hand.
You can choose Red in Guardian (or Chuck in Lightning Bird), Matilda in Cleric, and Bomb in Pirate. If you are using Chuck, attack every turn you like if there are two or more pigs on the battlefield, otherwise, use his secondary skill on any other bird if there is only one pig on the battlefield. If you are using Red, protect all birds with his secondary skill when his secondary skill has been expired. Then, use all other birds' secondary skill if it has been expired. Then attack every turn with Matilda and Bomb. Repeat this over until you win or lose.
Captain Red Beard can summon 2 Pirate Pigs, so beating him first is the best thing to do. Deal with the Pirates afterwards.