Can you tell us what moves you want
to give them?
I'd suggest replacing volcorona with heatran since it absorbs fire attk. And I would recommend jellicent since it can take fire/ water / fight well, which are dangerous for your team.
T-tar chople berry/ leftovers
Terrakion life orb/choice band
Garchomp life orb
Volcorona leftovers/life orb/choice specs
Aggron choice band
Amoonguss black sludge