hyper offensive goes like this
use your lead to set up sr and get a free turn for the next guy. doing damage is optional but the rest of the team should do plenty
then bring in your first guy and kill some shit then die
bring your next guy and kill some shit then die
etc etc
in order to be able to do that you need two things: offensive synergy and defensive synergy. offensive synergy refers to your team's ability to make use of each sacrifice. what use is it for gengar to blow up on blissey if the rest of the team is physical? you need your pokemon to be walled by the same stuff mostly, so that when you sacrifice your guy to cripple the counter, it can no longer deal with the rest of the team, and your mons have a party. by defensive synergy, I mean the ability to come in after a guy has died and set up in order to do the damage necessary for you to... kill all 6 of the other pokemon before your own 6 are all dead. basically, just pack in as many resists and bulk as possible.
the lead is also very important. there are basically three really good ways to get that early free turn: setting up screens, tricking choice items, and encoring moves. stuff like trickscarf jirachi or metagross, ds azelf, and encoreape come to mind. damage and scouting are also good bonuses, especially scouting, since the more you know about the enemy team the earlier you can start longterm thinking, which is of paramount importance to the success of hyper offense.