First, try to level up your magic spells and try to get your feathers from the black magician. Also, get your feathers from the drunk Malboro. Titan from the statue and Sylph from the beach. Then, put the game on 2P from the options screen. As soon as you attack, make the Cidtank shoot the Imp Robot's.Try to not get hit by the bombs and if the Cidtank's life is low, use one of the feathers of Sylph, Titan, or Ramuh. You should be able to kill them easily.