A few days back on Corien I was camping Zaricotl's spawn points from dawn to dusk pretty much but I never found a trace of him.
However, the next morning when I had just woken up I pulled a Reika. I kept thinking that he was spawned so much I had to go over. I nabbed Spiteflayer on my way over and guess what? Zaricotl was there. <3 He will stay with me for good.
grats on your new little guy!