The Fourth Angel

Just so you know... He's not meant to be on your team. He's meant to be evo'd and fed to Green Odins for skill ups. This is the "cheapest" way to skill up Odin. Your other option is pulling the REM millions of times and getting a bunch of Green Odins.

I've done a little statistical analysis on skill-ups. It takes 5 skill-ups to max skill Odin. Assuming a 20% skill-up success rate (when skill-up is 2x), it would take 23 of these guys to have a 50% probability of reaching the max skill level. 30 yields a 75% probability of reaching the max skill level. Again, this assumes a uniform 20% skill-up success rate. I have my doubts that the skill-up rate is uniform though (it may be affected by the monster, the time of day, the player rank, etc), because I have witnessed vastly different skill-up success rates. I max skilled my Odin over a period of a week after consuming only 9 of the 29 4th angels I collected (being a non-IAP player I had to collect a lot when they were available and then evolve them over time). In contrast it has taken me months to achieve 3 skill-ups for one of my Ogres. Of course I can't make any definite conclusions because I don't know Gung Ho's algorithm and I am always working with a relatively small sample size. I may start recording all of my skill-up attempts and see what I learn after several hundred tries.

Any idea how many of these guys I should collect to save to lvl, to be able to max skill my Odin.

Ah I didn't know that. How did you find out that stufff? But I don't think I'll be getting Odin for a long while since I have to scrape and farm like hell just to get the "average" strong monsters to their final evolutionary form (not even counting the super evo")