I've made some changes on my team and it works as good or even better, I yet have to lose with it.
I'm now using Skill Swap Cresselia with Eruption Heatran. If there's an EQr, I first Protect + Icy Wind. Otherwise, Eruption + Skill Swap. Chople Berry makes Heatran hard to kill and Icy Wind slows down enemies, just awesome.
Landorus-T and Hitmontop as double intimidate is really good too, renders useless all non-defiant physical attackers.