First 3 that I send out are:
Lucario - mega
Moves: close combat - blaze kick -ice punch - aura sphere
Golurk - asult vest
Moves: dynamic punch - shadow punch - drain punch - earth power
Haxuros - life orb
Moves: dragon dance - dual chop - bulldoze - poison jab
(Sorry for spelling mistakes)
Lucario has a good move set to cover a majority of types but is OHKOed by fire types
Golurk is fast and a good physical sweeper but drain punch is not healing him much
Haxuros is a beast, he has a power boost and a move to strike all enemy pokemon and a move that hits twice and poison jab Is just in case of fairy and dragon dance is a good power/speed booster but I don't know what nature to give him