Ummm, I would be worried about Anti-Lead Machamp. It sets up on Bronzong and the only way you'll get around it is by exploding on the Substitute.
[email protected] Berry
Adamant
252 HP, 160 Atk, 96 sp. Def
No Guard
Substitute
Dynamicpunch
Thunderpunch/Stone Edge
Ice Punch/Payback
Switching between Salamence and Gyarados may be your better option, lowering the attack enough to take minimal damage towards your other pokemon, but 4x weak to those two means you can't set up on it. Vappy can come in and Roar it away, but I don't see you being able to KO it without some set-up on Gyara, or exploding with Heatran/Bronzong.
I would be very careful about exploding that Bronzong, because you open yourself up to Deoxys-E sweep afterwards.
~T_S