So I have 5 monster to level 99. Each a different Arc. Leviathan, don penguin, pyrowyrm, coldheart, and raptorex.But when I talk to the guy he says I only have 4. I remeber using the level up item at the shop to get my fifth one to 99 does that make a difference??
try quitting out of the game and letting it restart something similar happened to me and this fixed it.
Yeah that fixed it thanks 
No problem.
What is the prize for 30 to lvl 99?
That would be darkling, which evolves into Necrodrake.