Board Thread:Questions and Answers/@comment-29176641-20160720074804/@comment-27095444-20160721133811

You should replace Brave Cat with Solar Cat. Also CatBurger won't do much for you...

Anyway, you need to reach higher user rank, because then you can upgrade your (super) rare cats to level 25.

Also, I'm not very sure about Bahamut. He might be useful against weaker enemies, but Cli-One is just too fast for him. I never was really lucky with Bahamut on that stage, he would just die in few minutes without doing anything... :P