Great Sage
Banned deucer.
Earth Power: The attacks the mixed set already has should keep the Pokemon you mentioned at bay.
Flamethrower: I'd much rather 2HKO Metagross and risk missing against Forretress. It's dumb to keep the latter in anyways.
Dragon Pulse: This isn't worth the loss in power, because mixed Dialga switches often, and Dragon Pulse doesn't carry enough power to OHKO Latias.
Stealth Rock: This can already be inserted in any set.
Flamethrower: I'd much rather 2HKO Metagross and risk missing against Forretress. It's dumb to keep the latter in anyways.
Dragon Pulse: This isn't worth the loss in power, because mixed Dialga switches often, and Dragon Pulse doesn't carry enough power to OHKO Latias.
Stealth Rock: This can already be inserted in any set.