Just in case you wanna know if you decide to add PS4 to your page, on either
Genem or Genecyst, any  version, there's a spell the character Lashiec does
in the Air Castle that freezes the emulator.
The trick to overcoming this, is save the game state after each battle round.
  Then when the game freezes (he's near the point of dying, and soon to use
the spell) restore the game at the last round that you successfully fought
without any freeze.  Now, put all characters on defense and use one little
attack at a time, each time saving the game state after you hit him and see
it don't freeze.  When the game freezes, it means Lashiec's on his last leg.
  Restore the very last save and give him all you got, you need to kill him
before he can give his last strike(the Emu-Freeze Spell).