Level 2: It is possible to damage Broly without the above characters if you can inflict a damage higher amount of damage than 25,000.
Level 3: It is possible to damage Broly without the above characters if you have characters whose Super Attack can "(Greatly) Lowers DEF."
After you "Greatly Lower DEF" once, Heavy Hitters with SA lvl 10/10 can inflict significant damage on Broly. However, it would take two consecutive "Greatly Lower DEF" for weaker characters to inflict damage on Broly (for example, non Blazing Battle characters).
Critical Hits will bypass Broly's tremendous defenses and will inflict full damage on him.
can be used to reduce Broly's tremendous defenses to 0 upon being attacked for 2 turns allowing you to inflict full damage on him during that time. It is recommended that you use damage reduction items to ensure that Guldo survives the attack.