Possibly the biggest threat in the battle is the Bore. The Bore comes out extremely quickly during the battle so put out attackers right away. Use anti-red status effect cats, especially Knockback.
If you have Dark Cat, he is a very effective meatshield against the Bore, as he has longer range and can actually deal damage as a meatshield.
However, if you have awakened bahamut, you can easily kill the bore and destroy the base before the sloths or Kurosawah can even come out