http://universps.online.fr/pso/bb/monstres/liste.php
Sadly you just have to compare to other enemies boss wise.
I've taken the data from this to create some stats after applying Zalure 30 to them from my knowledge (zalure 20 you pretty much just add 80-120 defense and zalure 15 you add about 130-190 defense to most things depending on the stat's size (bigger defense you add more of course)).
vol opt and gol dragon are of course not affected by zalure so you have to just suck it up and punch through their base defenses.
def with zalure 30, enemy, evade, what to compare hitting them to
263 sil dragon (390 evade) (compare to Pal Rappy)
420 dal ra lie (680 evade) (compare to Dolmdarl)
802 vol opt 1 (506 evade) (compare to Hidelt2)
902 vol opt 2 (724 evade) (compare to Mil Lily2)
472 falz 1&2 (825 evade) (compare to Goran Detonator)
503 falz 3 (750 evade) (compare to Gulgus2)
310 barba ray (356 evade) (might as well compare to pal rappy again)
690 gol dragon (120 evade) (um no real issue hitting this thing)
379 gal gryphon (530 evade) (compare to Merillia)
466 olga 1 (780 evade) (compare to Gee)
524 olga 2 (690 evade) (compare to Ze Boota)
489 for ep4 bosses 1st form (270 evade) (compare to Mothvist2)
564 for ep4 bosses 2nd form (828 evade) (compare to Goran Detonator)