I don't even have gameshark...It all depends on the skill and strategies you have!Useing Reflega was the trick to defeat him...When everytime he attack,use reflega!

The problem with that is that MP runs out ANDyou go into MP charge, which takes for fricken ever without Ethers or Elixirs...

Meh....I used the Hi-potion to heal myself and i used the berserker charge attack at Sephiroth so that thers time for my MP to charge finished.Oh and 1 more thing....I only used 1 ether when i defeated him!

Here is a great way...
Have your self at Lvl. 85 or higher.
Have Ulitma Weapon.
Put 2 Hi-Potions and Ethers at the L2 menu, along with Cure and Reflect.
Have Trinty Limit on.
Have plenty of powerful abilties equipped, your're alone with no Forms or Summons.

Use Trinty Limit, then run! When he disapears, jump and attack, you catch in mid-attack! When orbs start surrounding you, use Reflect!
Use Glide to fly away from his giant fire attack!
Win, and earn a new drive bar, making a total of 7!

I beat him with a cheat code cuz i wanted that key blade so bad

Well...I beat him at lvl 64. I didn't have glide..I don't think. I had all the elxiers though and used all but one. I had oblivion, it took me alot of tries...but only fifty at the most.

I did pretty well compared to how much you guys complained about him.

1.His Keyblade is,in fact, worse than the Ultimate Weapon. You gain only 1 strengh and lose alot of Magic.(Really, a little strengh isn't worth it.
2.What cheat code?

But however, it gives you Negative Combo, allowing you to activate the finishing move of a combo right off the bat, destroying many enemys in a small matter of time. Anything else, I just use Magnetga to draw enemies in and attack them while their pinned.

For Sephiroth, I fought him mono-a-mono, without use of the Trinity Limit. Sometimes, I'll purposely let him hit me up in the air so I can Counterattack then follow up with a combo. The Ultima Weapon is a must. I've beaten him at level 63 but, getting to level 99 allows you to learn another MP Haste(or Rage?) Ability. Berserk works well, when trying to fill your MP back up.

He wasn't especially tough, but enjoy the fight while you can since unlike the first game, you can only fight him once. Make a seperate Save File after you defeat him. That's what I did.

I was at level 71, had 6 item slots filled with elixer. had 2 shortcut commands for the Elixers and 2 for Cure. When the screen gets dark hit triangle to block his slicing attack. if you are hit into the air use retaliting slash and then attack when you get to the ground use cure or an exliar if needed. when he goes into the air and ays "SIN HEARTLESS ANGEL!" use trinity limit and hit triangle repeadly to keep attacking. When he says "PERISH NOW!" Run away from him he is like a magnet so you should keep jumping away from him. When he is on his last bar of health use trinity limit like you do wth the heartlesds angel attack. you should beat him. I won on my 1st try with this stratagy. P.S. The only growth ability I had was High Jump Level 1 . I used the Ultimate Keyblade.