Since he refers to the charts in his question, it appears that he has done so already, so referring him back to them doesn't do much
Level 14 should be correct if there is no Silver/Titanium, however even with one of those at IV as well, the requirement should be 17 and not 18.
So if you saw one that was 18 with only elemental on it, perhaps it was something more custom, like a drop that was enhanced?
Edit- Oh, the rod. Meh! Beaten again.