DR must have good enough gear too resist GG’s aoe.
Start with fear on Magna. Do not aoe, so that GG stays feared.
Best approach is that after the fear, B2 gets triggered out of invi, and you get to kill B2 before GG gets out of fear.
If you don’t have the firepower to kill B2, try to sync the moment you take him bellow 50% hp (when GG will get marked) with Hk’s aoe. If you manage that, it’s an auto win.
In some extreme situations, you might chain the deaths of the other robots, which will trigger multiple consecutive AOEs from GG, so best to avoid unforeseeable actions that can lead to this (using Hk’s aoe without GG being marked and while everyone is full health)
Malak helps, but he is not mandatory. If you have strong enough 5xSE (G13 Maurader) you can attempt this without Malak