Board Thread:General Discussion/@comment-29394649-20160801050129/@comment-5741122-20160802052129

Use plenty of characters with the Link Skill Blazing Battle. It disables Rampage and is basically the only way to do any real damage. There are also a few characters with a Passive Skill that disables it.

http://dbz-dokkanbattle.wikia.com/wiki/Berserker_of_the_Destruction

On that page is a list of characters with Blazing Battle and characters with a Passive that disables Rampage. In the comments section there are tons of users that mentioned how they beat the event and share tips. You can request help there as well.

I myself just used a team full of characters with Blazing Battle. I also had AGL Kid Trunks and STR Goten.