These are the mono teams I use. Rare is a little different from epic and legendary since Belitung is the only attack buffer and Ulmer, Valen, and Gill-Ra are the only defense reducers. Therefore I will often run 4-1 on later levels so the combo deals enough damage to kill bosses. Otherwise just stacking the highest attack, single target hitters tends to be optimal. Since 3*s are so cheap to max out, some people just level 5x Balthazar, Bane, Gato, Hisan/Berden/Mnessus, Wabbit/Namahage.
