I'd use 3 to 6 deadons, for healing. 6 to 8 yutys for their roar. 18 to 20 gigas/rexes for damage boosted with the yuty roar and 10 to 16 strong flyers such as agries, griffs and wyverns. Get all to aggro on the brood and get 10 dilos, they will help with the small ones. Enssure theyre all over lvl 90 and have good stam and melee. Bring a snow owl as your mount, heal dilos and others live the deadons yutys and such, stay safe and thats how i would recommend the alpha fight (lower dinos for gamma and beta)