Teach Earthquake to as many of your pokemon as possible. Ground has great type coverage.
Firstly, Salamance, weak to ice and rock. Try this. Earthquake(covers rock weakness), Flamethrower(for ice weakness), Dragon Claw(STAB), Fly(STAB).
Next, Tyranitar, weak to fighting, bug, grass, water, and steel.
Use this. Earthquake(to cover the steel weakness), Stone Edge(STAB), Crunch(STAB), Thunder Fang(to cover the water weakness) Or Fire Fang(To cover bug, grass, andsteel weaknesses).
Metagross, weak to ground and fire. This is good. Earthquake(to cover fire weakness), Zen Headbutt(STRONG STAB), Meteor Mash(Strong STAB), Hammer Arm(strng coverage move).
Now for Blastoise, weak to electric, and grass. Use this. Ice Beam(Grass weakness), Toxic(for good weakening), Earthquake(electric weakness), Surf(STAB).
Sceptile, weak to ice, fire, poison, flying, and bug. This is excellent. Earthquake(for fire weakness and poison), Rock Slide(to cover bug, ice, fire, and flying weakness), Energy Ball(or leaf blade if higher attack for STAB), X-Scizzor(strong move).
And now, Charizard, weak to rock, water, and electric. This is Excellent. Thunder Punch(for water weakness), Earthquake(for rock weakness, and electric) Flamethrower(STAB), and AirSlash(STAB).
HOPE THIS HELPS!:)