Typically, you'll want to go with Flare Blitz and Wild Charge together. There's no point in having a coverage move if it can't knock out anything he's weak against.
On a standard suicune(full defense, no EVs in HP), a Standard Arcanine (Full attack and life Orb) will do 121-142 damage using thunder fang, meaning it would take about 3 hits to bring suicune down.
A Wild Charge in the same situation will do 167-196 damage, about enough to 2HKO a suicune, so it wouldn't be able to safely switch in, especially with rock support.
If you're concerned about how much damage you take from the move and life orb, you could always use morning sun to restore your health. You could also use a choice band over life orb for massive amounts of damage.