Rugged Ridge has 4 wild species on its encounter table, appearing between level 30 and 36. Rates below are the chance of each species when an encounter triggers, not the chance of an encounter itself.
The wild Dokimon you can find here are Rattler, Coalbra, Atlas, Lantis. The most common encounter is Atlas at 42.9%; the rarest is Lantis at 14.3% — worth knowing before you settle in to hunt one specific spawn.
Dragon
Water
Fire