After dealing a sufficient amount of damage to the enemy base, several Mooths will spawn and the spawn rate of Celeboodles will increase dramatically.
Begin the battle, spam Wall Cat and Paris Cat to counter the Jackie Peng and also spawn high cost characters. Spawn Valkyrie Cat and Bahamut Cat when player's cats reach the Enemy's Castle. A lot of Mooth and Celeboodle will come out, and it can break through player's defense and rely on Bahamut Cat, Kung Fu Cat and Dragon Cat. 
Cat lineup:Macho Cat, Wall Cat, Samba Cat/Crazed Macho Cat (I used Crazed Macho), Sexy Legs Cat, Paris Cat/Drama Cats, Dragon Cat, M. Titan Cat, True Valkyrie Cat, Crazed Bahamut Cat, any tanky Uber (I used Mitama)
All you really need to know is that mythical titan is helpful here. If you can also manage to stack Sexy Legs and Dragon Cats, then this stage is a piece of cake.
There are much harder levels than this one, but you need to know The next stage is not a joke like this one...
- This stage is essentially just Gunman's Dawn with higher strength magnifications,