NPC Damage Types:
Amarr Navy - EM / Thermal
Angel Cartel (Frig) - Explosive / Kinetic
Angel Cartel (Crusier/BS) - EM / Thermal
Blood Raider - Thermal / EM
Guristas - Kinetic / Thermal (sentries do EM)
Mercenaries - EM / Kinetic / Thermal / Explosive
Minmatar Fleet - Thermal / Explosive
Mordu's Legion - EM / Kinetic / Thermal
Rogue Drones - ALL Damage Types
Sansha's Nation - EM / Thermal
Serpentis - Thermal / Kinetic

Damage types to use
Angel: EM(shields) Explosive(Armor), or thermal
all round
Amarr Navy: EM (shield) Explosive(Armor)
Mordus: EM (shield) Explosive(Armor)
Gurista: EM(shields) Explosive(Armor),
Thermal/Kinetic all round
Blood: Thermal
Sansha: Thermal
Serpentis: Thermal
Mercenary: Explosives
Caldary Navy: Explosives