I think the only one I'm missing from that list is to cap an Uragaan. I've never seen him limp he just rolls around till he's dead. Should be fun.
For an easier time capturing, you could get the Capture Guru skill, which can be gained by getting +10 Perception. If a monster is paintballed (or if you have Auto-Tracker), the icon on the map will flash when the monster is ready to be captured.
Another way to tell is if the monster goes to sleep. If Uragaan goes to area 6 (which is the place noname2200 was talking about), wait a bit outside the area and see if it goes to sleep - this is the area where it will if it is weak.
Don't worry, Mop it up, I'm only 47 so I don't even have my urgent available yet. There is still time.
Excuse me, I misread your post. I thought you said that you, yourself, reached 50, but it seems you meant that the person you were with, Lisa, is the one who reached it.