Let's think that you are in the depths of a dungeon with low HP or PP and you find a Monster House. Here's a way to avoid it without losing HP, PP or Reviver Seeds:
When you encounter the Monster House, use a Petrify or a Foe-Hold Orb. That way, every enemy on the floor will be petrified and it can't move until it's attacked. Then switch off all your partner's moves, so that it doesn't attack your enemies because they will no longer be petrified if they are attacked. Finally, walk carefully to the stairs without hitting anyone. Remember that since you don't hit them, foes will stay there and they won't move!