Strictly speaking, no there isn't. There are a few monsters that tend to appear in certain areas more than others. These include;

Simurgh's can only be found in area's with light on the Djose Highroad.

Qatuar's can be found in groups of one, two and three after activating the various Qatuar stones on the Thunder Plains.

Cactuar's are found most frequently in the Cactuar Village in Sanubia Desert.

Ogre's, Malboro's and Chimera's can only be found to the far west of the Calm Lands.

Tonberries can only be found in areas without the purple gas and preferrably where there are lots of pyreflies in the Cavern of the Lost Fayth.

In the Omega Ruins, the rarest monsters can be found as forced encouters on the way to Omega.

Apart from this there's only one other way of finding rare enemies. When you load up the game, it sets out what monsters you're going to fight. If after about ten or so battles you can't find the monster you're looking for, try resetting the game and looking again.