The whole strat should be as follows: Cast big guard with cloud first turn always even if you see aqualung. Revive Cid and allow his atb to fill as much as possible then open clouds menu to get ready to throw Phoenix down on Tifa. When Jenova’s turn is over and Cid is alive throw the Phoenix down and immediately hold time with Cid’s ESkill menu. After cloud throws the Phoenix down and his atb is empty, cast big guard and allow atbs to fill as much as possible. When the atb is paused during big guard, do cross slash. Hold circle to do one physical attack with Tifa and hold time with Cid. When tifas arb is empty, cast death sentence on Tifa and hold time as soon as tifas atb is full. During the death sentence animation, use deathblow with Tifa and hold time with cloud on attack. When tifas atb is empty, hold circle to attack with cloud, dblow with Tifa and hold time with Cid. When tifas atb is empty, defend with Cid and hold circle to do the last deathblow. Hope this helps.

The whole strat should be as follows: Cast big guard with cloud first turn always even if you see aqualung. Revive Cid and allow his atb to fill as much as possible then open clouds menu to get ready to throw Phoenix down on Tifa. When Jenova’s turn is over and Cid is alive throw the Phoenix down and immediately hold time with Cid’s ESkill menu. After cloud throws the Phoenix down and his atb is empty, cast big guard and allow atbs to fill as much as possible. When the atb is paused during big guard, do cross slash. Hold circle to do one physical attack with Tifa and hold time with Cid. When tifas arb is empty, cast death sentence on Tifa and hold time as soon as tifas atb is full. During the death sentence animation, use deathblow with Tifa and hold time with cloud on attack. When tifas atb is empty, hold circle to attack with cloud, dblow with Tifa and hold time with Cid. When tifas atb is empty, defend with Cid and hold circle to do the last deathblow. Hope this helps.