Molten Core
Lucifron - Magmadar - Gehennas - Garr - Geddon - Shazzrah - Golemagg - Sulfuron - Majordomo - Ragnaros
Golemagg
Golemagg is a pretty simple fight given that you don't need to do much but DPS him down.
Pull
(Click to Enlarge)
Golemagg Abiltites
Earthquake: When Golemagg reaches 10% life left everyone near him will get hit with a lot of damage as the ground starts to shake.
Pyroblast: Golemagg will randomly target someone and shoot a fireball with a 300 DoT.
Core Rager
Thrash: gains 2 extra attacks.
Mangle: Target suffers 80 damage.
Strategy
The Core Ragers are unkillable and thus are off-tanked until Golemagg goes down. They will die when he dies.
Similar to other boss fights one hunter per off-tank that will pull the core ragers after the MT has attack golemagg.
Have the 2 warriors tank the core ragers back away from golemagg as shown in the picture and just DPS down golemagg.