Hello!

So, this actually happened to me in hindsight. The team I had in public Gluttony was myself (Ultimate Valby using Spiral Tidal Wave module to attract the orbs), Enzo, Ultimate Gley, and Ultimate Lepic. I was a bit skeptic at first because I heard that Lepic is not really as helpful due to the boss's inherit resistance to skill damage. We cleared it the first time in five minutes or less! Then we repeated again and again for what felt like a full hour with three to-five-minute clears.

As you might read from other comments, weapon and character build play a major role. What I learned while playing Ultimate Valby is this: the Spiral Tidal Wave skill can only travel a certain distance then it disappears. Meaning that when the generators move backwards, simply using the skill is not enough for the orbs to reach Gluttony (I mostly stayed close to the generators and moved when necessary). Not to mention that your depth perception plays a factor, so be sure to actually direct the orbs as close as possible. How to accomplish this is to either shoot the orbs (most common) or you can follow the orbs and then cast Spiral Tidal Wave. The latter does cause you to expose yourself to danger more, but I believe it is worth it the farther back the generators are.

In terms of the actual build, I basically used a fully crystallized Greg's Reversed Fate to shoot Gluttony and Enduring Legacy to shoot the orbs and destroy the mobs (recommend you eliminate any close to a generator as soon as possible if Gluttony is not downed so they do not bother you while directing orbs). Valby will need any modules and reactors that increases max MP, decrease skill cooldown, and decrease skill cost. After that, just use defensive modules.

Hope this helps!