Battleground
The level starts off with a Rain D. A few more Rain D will spawn, then the boss (Elder Sloth) comes. After the boss spawns, R Ost will join the spawning party, entering the mix with a spawn rate slightly slower than Rain D.
Strategy
Bringing Rich Cat and Cat CPU is very highly recomended.
Lineup: Mohawk | Eraser | C. Wall/M. Eraser | C. Macho/M. Mohawk | King Dragon (or M. K. Dragon, if you have) Bahamut Cat (Special Cat) | Ururun | Jamiera, and any Ubers you may have.)
Start off by waiting for the first Rain D. to spawn, then spam all your meatshields and King Dragon. Slowly spawn your expensive stuff. If you have the Cat CPU, turn it on when all your expensive stuff has been spawned and your wallet is maxed.
Megaphrodite is useful for this stage, as it can hit Elder Sloth for massive damage while protected behind meatshielding for the R. Osts and Rain Ds.
4-stars:
Line 1:Attack catcombo(s)
Line 2: 3 cheap meatshields, cyborg Cat and A.Bahamut Cat.