Not two, three. Four if you count the Reverse Zantetsuken.

1. No Mercy (you can use it when you have seifer as your ally)

2. Demon Slice (when you fight him the first time in disc 2 he uses it pretty often so watch out a little)

3. Bloodfest (he only uses it during the fight in Lunatic Pandora when you cut his HP down to a certain amount and can wipe out your whole field)

4. Reverse Zantetsuken (only happens when you have Odin before fighting him, he will use it when Odin tries to kill him but Odin himself gets killed instead. The sword will fly into the sky and someone will catch it. At this time, it is highly recommended that you devote all your turns to drawing tons of Auras from him with occasional healing from Seifer's bloody attacks, and since you are not attacking him, he won't use his Bloodfest. After a few turns, some weird guy with four left arms will come down and speak some crap and tells Seifer to taste his blade. You win the battle instantly because he blows Seifer out of the battlefield. That is Gilgamesh, some weird GF that likes to collect swords. Later on, Gilgy will replace Odin and will come out at random at ANYTIME during ANY BATTLE. This nifty strategy I use gives you minimal potion/curaga spamming when you can instantly win the battle a few turns later without getting too hurt or low on magic to fight Adel.)