Hmmm ... There may be a typo in your query ...
While searching the appearance of the surname Montes in Puerto Rico, I ran across the figure of Toribio Montes CALOCA. He is a distinguished military figure that arrived in the New World in 1804 and lived in various jurisdictions in the New World (I noted Puerto Rico, Cuba, Chile and Bolivia) before returning to Spain for his last days.
This Montes CALOCA may the original figure you are looking for - perhaps his last name was varied by the descendants, common at the time when you wanted to distinguish between your legitimate and illegitimate children.
Hope this helps!