you might want to add that you can draw most of the latter GFs from the bosses at Ultimecia's Castle, but only if you previously missed them. ex - you can draw Eden from Tiamat without having to go to the Research Center and fighting Ultima Weapon. here's the actual list:

well, before that, let me just note that if you were lazy and didn't draw GFs as early as Siren, after beating Sphinxaur at the top of the stairs in the Front Foyer, choose to unlock the Draw command. you can then get the following GFs from the corresponding bosses -

Siren-----Tri-Point
Leviathan-----Trauma
Pandemona-----Red Giant
Carbuncle-----Krysta
Cerberus-----Gargantua
Alexander-----Catoblepas
Eden-----Tiamat