It makes sense to use before pull in some situations.

For example, Bismark EX... everyone is gonna get damaged/stunned as soon as fight starts.

For better results, put it on a WAR with defiance. For even better results, ask the WAR to use Convalescence and Mantra. That's roughly a 50% more potent adloq (or almost 65% if you have a MNK applying Mantra) that you can spread to everyone in the party, and they will still have the galvanize effect after the initial damage. The stoneskins in everybody remains untouched.
Both healers can pretty much just DPS on the first set of adds, very little healing needed.

For Ravana EX it really helps on last phase stomps. At this time Ravana has 5+ stacks of damage up buff, so everything hurts a lot.
Although WAR OT will not have defiance on usually at that point, so you can just Adloq whomever, maybe the PLD if he has Convalescene up for a 30% increased potency of the galvanize effect.