Unless you count the few trainers in the sewers, I don't think so.  There is a strategy you can try with some low-level Pokemon.  The first thing you need is something with Heat Wave, Blast Burn, Eruption, or Lava Plume.  If you have something in your box that can put Garbodor to sleep or paralyze it (to buy a turn), the Fire user can be of any level.  This will ignite the cave and deal damage to both Pokemon equal to half their maximum health.  It also turns the field into a Cave, so the Garbod