Was going to say, you need green and up mobs to gain defense skillups.
So if you say have a brand new lev 100 which needs skillups, have your friendly neighborhood mage take off EMear and cast lev 80 pet (air or water doesnt matter) TIP: swarm pets make this go quicker.Of course you can also duel a shammie dog,etc.
Goto the guildhall where your discs will last forever and get as many Heal over Time spells and Regen spells as possible... pop Riposte disc... /duel a necro... necro chain casts all 4 swarm pets.
For casters, Fill up your buffs so you're buff locked, then pick a fast casting Self aa that puts a buff on... since you're buff locked it fails and instantly resets but you get a skill gain.
Self only Spires, Perfected Invisibility, Empowered Focus of Arcanum, Cheetah... all work good