Make sure you have Typhlosion as your Lead-Off Pokemon. With Stealth Rock abundant and your Typhlosion running Eruption, he needs to be at full health. I personally am a fan of Donphan:
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Nature: Impish
EV Spread: 252 HP / 212 DEF / 46 ATK
Earthquake
Stone Edge
Ice Shard
Knock Off
Earthquake is for pure STAB deliciousness. Ice Shard is for weakened Dragons (e.g. Garchomp, Dragonite, Salamence), and Knock Off is good for ridding your opponent's Blissey of Leftovers or that Heatran of Choice Scarf. Stone Edge is a powerful attack. I like to run my Donphan with more Attack EVs then the standard, but normal the spread is:
252 HP / 252 DEF / 6 ATK