I am wondering I saw some guys with lvl 7 pet skills.
How to get them ?
Are there level 7 pet skills for every kind ?
Level 7 pet skills are available at Pet Skill Tutor in Seville city. They require 10 Guardian Fragments to be exchanged. They only come from IM and are quite expensive. I would say its not worth it, unless you're really maxed on everything else.
Check out various tools for VCO at The Pirate's Cove: