Board Thread:General Discussion/@comment-31841271-20180808192343/@comment-2113997-20180808202019

I found this a long time ago on in the Quest Mode Guide: That seems to be the only one left on those pages. I thought Saibaiman were on there to but can't find them anymore. Saibaiman are actually more easier on Radditz' story event. Since you also need to defeat 1000 to complete those missions.
 * Cell Jr.: Area 6: The Androids Attack! level 10

All you can do is find an Area and level with a higher amount of these enemies. Most of them are random but certain Areas and levels spawn more of 1 kind. Like Area 10: Red Ribbon Machinations would spawn more Red Ribbon Army enemies since the Area is based around the Red Ribbon Army.