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In the Omega Ruins, to easily defeat the Ultima and Omega weapons, first go to Remiem Temple and get the Aeon's Soul item by defeating the summoner there, then fight her some more to get some Mega-Potions. Use these and other items to teach Curaga, Haste, and Protect to Bahamut. Now go to the Omega Ruins, ( I would suggest running in circles for a while near the Save Sphere so you can increase your stats ) and work your way through until you get to a platform that looks like one of those Warp Points from Mt. Gagazet. Step on it, and it will rise out of the floor, allowing you to jump over to the ledge. Now, make sure that Yuna and Tidus are in your party, and go through into a large room, and now you will fight the Ultima Weapon. Start out the battle by having Tidus cast Hastega on your party (if you don't have Hastega by now, then I'm surprised that you've made it this far) then, have Yuna summon Bahamut. Now have Bahamut cast Haste, then Protect on itself. Now attack the Ultima Weapon with normal attacks, casting Curaga on yourself when Bahamut's HP gets around 2000-2500, and use Mega Flare whenever possible. It shouldn't take too long to defeat the Ultima Weapon ( I killed it with an Overkill bonus after two Mega Flares and about 10 turns worth of attacks). After the battle, Auron says that you've only fought the shadow of the Omega Weapon, so heal up as much as you can and step on the warp tile. Now go to the right, there are no random battles here, but every time you walk out into an open space, you encounter a fiend, unless you've already passed through that space. when you get close to the fortress, heal up from the battles you've fought and prepare for another fight.

This time, start off the battle without casting Hastega (doing so will allow Omega to attack you, and that's a bad thing), instead, start out with Valefor, and just go on an all-out offensive, but don't use the Aeon's special abilities, they will cost you a turn. Use their Overdrives whenever available, and for the elemental Aeons (Ifrit, Shiva, and Ixion), if their damaged at all, cast one of their on elemental spells on them, it will heal them. If the battle lasts long enough to force you to use Bahamut, then just repeat the same strategy as the last battle. If you run out of Aeons, just use the normal party members the same way, healing and hitting.