For a quick hint…go to the islands of heaven and hell and junction 100 death to someone along with speed bonuses. You should fly up the levels in no time. There are also draw points for ultimas and stuff if i remember.
If u got lots of money(which I bet u have,since u are at Ultimecia)I recommend u go there and draw once in a while.
Oh and junction magic on the character as much as you can to get more.
Following up on virtualchan’s post, have your GFs learn stat-boosting equips, like Str-Boost. It adds +1 for every level you gain. Meaning that if you were on Level 10 and went to Level 80 with the Str-Boost on the entire time, your Strength will be 70 more than it would’ve been if you didn’t use it. Prety good imo.
For Ultima Weapon, Squall’s Lionheart puts it down. Just cast Aura on him and switch characters with the Triangle button (right?). For Omega Weapon, you are better off refining some Cards, like the Laguna card, and casting Hero or Holy War on characters. You can also use Shockwave Pulsar, which if you hold down Select and press Square repeatedly, can be boosted to over 9999 damage. The same goes with the GF Eden, which can potentially do 65,535 in one hit.
iirc, curse spikes refine into Pain magic, not Ultima.
Should have clarified. With Tool Rf, 100 curse spikes become 1 Dark Matter, which mods into 100 Ultimas with Forbidden Magic Rf.