1. Dire Miralis (The Dire Miralis is just more powerful)
2. Giant Savage Deviljho (Even though the Deviljho's weak to Dragon, It has so much power that I'd say it would win)
3. Hallowed Jhen Morhan (If the battle is really fought in the land arena, then the Jhen would just spam it's belly flop, slaughtering the Rathalos)
4. Great Jaggi + Great Baggi (The Great Baggi is the most powerful of the three "Great" monsters. So teamed with the Great Jaggi, I think it would win)
5. 2 Brachydios (The Brachydios' Slime slaughters most other monsters, I don't think the Lucent Nargacuga would stand chance)
6. 15 Gobuls (As powerful as the Abyssal Lagiacrus is, 15 Gobuls will just be too many for it)
7. Black Diablos (This is really close. Overall, I think the Black Diablos will win though of it's incedibly powerful underground attacks)
8. 60 Silver Rathalos' (Alatreons are powerful. Extremely powerful. But 60 Rathalos' will, just like the 15 Gobuls, overpower the Alatreons)
9. Gold Rathian (The Barroths are weak to fire, and the Gold Rathian's fire attacks will win out against all five Barroths)
10. 2 Purple Ludroths (The Baleful Gigginox isn't powerful enough to take on two Purple Ludroths, nor does it have any strong attack vs them)
Might I make a suggestion. For future battles, you could try specifying if the monsters damage others on their team or not. And have some matches where they damage each other, and others where they don't. Just a thought.