Training Defensive Skills

 
Better is to Stealth everyone. Just take one level, preferably L5, as Rogue (esp. if you also want high Shield) or Monk/Ninja (if you want to do some Crit training). Best scenario is 6 or more seekers, either in the Ramp Room or on the Beach, where you can get to the very edge of Thrown range--they do very little damage and hit rarely from that far. It's also good if you can Sleep or Freeze them long enough (2 rounds) that combat will end, so you can save without killing them. 

Shield: see above. Note: If you want to train Shield together with the other defenses, you must remember to swap weapons so your shield is in effect once you are in Defend.

Reflextion trains largely the same way, but since that doesn't usually happen till later, Millipedes are good for that, or frogs, or whatever mosquito types stay at Thrown, all in the Swamp.

Iron Skin can train simultaneously with any of the above, as long as they're still hitting you occasionally. - Scatter