Just run about and generally just kill the best weapon to use to fight a boss would be to us the M16/Assault rifle it has a good firing rate and it also has an undermined grenade launcher that requires no reload after a shot of a grenade the m16/Assault rifle only takes a few seconds to reload and can hold up to 220 round with 30 rounds in each clip so this would be the best weapon for fighting bosses
In multi player with the game type set a sobatage and level camp.
In the level there is a small passage through to the second bomb site.
Towards the middle of the the level you will see a ledge covered with vines walk into it now you have found a good place to from bot trying to kill you. If you are confused it is over by the section where there are bamboo poles in the ground.
Ok, you may not get this your first try but you will. The first generator will be on the first building on the right.
Kill the guard that guards the building quickly or else he will hit the alarm. Pick the lock of the door and take out a shotgun, kill them, then destroy the generator.
Then there are 2 other enemies. The one at the gate is the last one you want to kill in that room place. Take him out and there is a small hut with the next generator. Find the next door and got to the left and shoot the one guy walking back and forth then go into the second hut or the hut on the right and there is a generator.
Kill all the enemies around that whole room then finding the last generator is easy. Then go and find it later, and listen to the girl.