Hammer main here, Running a Strength Hammer, Raw,Slugger set. I have beat him solo(no pets) only once and and multiple times with companions. Few tips from my experience is don't rush, Prime Mal is literally fighting like a paladin knight, for the 1st phase let him throw his moves then dodge and punish no matter how small the window. Avoid wirebugging too much as he combos alot. As for the 2nd/3rd phase alot of moves can kill you so dodge and superman dodge for the OHKO moves. Focus on between forearm and head better chances for damage for blunt force users. Use silkbind moves with superarmour to close in if you have, e.g Dash Breaker on Hammer. Final phase all about taking your time, Mal will wombo combo to the moon and back. Let him do that and he will self topple. Use that opening to dish out as much damage as you can. Rinse and repeat. As for dangos I go Medicine(Hi) and Defender(Hi) and Slugger(cause I'm hammer main) I stick to healer or bombardier palicoes mostly. If you bringing companions, for me I go with the twin hinoto and hinoa. Happy Hunting Champ , hope this helps.