All are lvl. 100

Hydreigon-Timid-White Herb-Dark Pulse,U-Turn,Fire Blast,Draco Meteor

Lucario-Timid-Focus Band-Dark Pulse,Psychic,Aura Sphere,Dragon Pulse

Garchomp-Jolly-Muscle Band-Dragon Rush,Crunch,Earthquake,Brick Break

Heracross-Adamant-Focus Sash-Close Combat,Megahorn,Night Slash,Stone Edge

Salamence-Jolly-Scope Lens-Zen Headbutt,Dragon Rush,Brick Break,Crunch

Metagross-Adamant-Leftovers-Zen Headbutt,Meteor Mash,Hammer Arm, Bullet Punch

imma say the obvious... you're screwed if you meet a mamoswine.
all of your team is susceptible to an ice attack, which is ok if you have a counter, and i see you do. fighting and fire types will own an ice type, but it needs 2 be stronger than brick break. try (if you have it) focus blast/punch.
with the three none-dragons, don't meet a fire type. all are weak to 'em, and you have no counters for that. find a water type move or you're screwed.
andrew, none of his pokemon are fire type, only 1 has a fire attack. you are confused with dragon.