This information was stolen from AOD Legend.
This stage can be pretty easy to beat as long as you have a power long distance hitter and lots of meatshields. Eraser Cat, Ramen Cat, Thaumaturge Cat, and Catasuraus can be used as meatshields, while have Paris Cat, Drama Cats, and Crazed Bahamut can be used for long game distance hitting and powerful attacks.
First you build up money to max out wallet level and in general. Do not let your cats get too close to the enemy base or else’s you’ll have to start over. Once you have max money, spam everything. Make sure you always have meatshield protecting Bahamut, because if he dies it’ll either be game over or difficult to recover.