I couldnt beat Ultima Weapon so that means I didnt get Eden and now im on Disk 4 and cant get back, I have all the other GFs. So is Eden a big enough deal to do the game again?

Yeah, i had problems like that the first time i completed the game and i missed out on some stuff coz of Omega/ Ultima Weapon. I wudn't bother starting again, altho Eden is overkill for just about everybody except Ultima Weapon, Omega Weapon, and Ultimecia. Cool summoning sequence too.

You can still get Eden, when you fight Tiamat Draw Eden from him, he's in Ultimecia's castle

OK I admit that I already knew that you draw from Tiamat and I havent fought him and I know where he is but I havent got the ability draw yet and I cant find any other monsters like Tiamat (already found about 5) I know it would be hard but could you help tell me where the remainder monsters are

Try buying the Official Guide Prima Guide. 10$ or so.
Edit: Eden may be overkill, but I don't think that power is why people bother getting him. His GF abilities rock. Can't beat Devour.

Thats good and all but there is no where to buy it and ive tried to off a walkthrough but my piece of shit printer dont work

I call it Barnes & Noble, Books-A-Million, or Crown. Just ask them to order it. If that doesn't work, then just play it without help. Game's not that hard.