I know the Marine Goblin has a chance of increasing Sirens skill level. Does anybody know what increases the lil' dragons skill level? I am wanting to be able to build an ADK team that can use all of their abilities more often.
It's going to be difficult to increase the defensive dragon series's skill type, because they are essentially different skills when they level up. Only skills with the same name can grant skill level increases, and it will reset to level 1 if the name and effect changes when you evolve a monster.
So to increase a Meteor Volcanic Dragon's skill level, you'd actually have to feed him another meteor volcanic dragon.