Icey Hot Cavern has 5 wild species on its encounter table, appearing between level 29 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 Plasma, Misma, Aoimon, Frossla, Hellfire. The most common encounter is Plasma at 27.3%; the rarest is Hellfire at 9.1% — worth knowing before you settle in to hunt one specific spawn.
Electric
Ice
Dark
Grass
Dragon