error handling in case the randomizer picks a pokemon that does not exist

Data/Scripts/050_AddOns/GameplayUtils.rb

@@ -700,8 +700,11 @@ def regirock_steel_move_boulder()
     pbSEPlay("Entering Door")
     pbSetSelfSwitch(switch_event.id, "A", true) if switch_event
   end
-
-
 end
 
 
+def displayRandomizerErrorMessage()
+  Kernel.pbMessage(_INTL("The randomizer has encountered an error. You should try to re-randomize your game as soon as possible."))
+  Kernel.pbMessage(_INTL("You can do this on the top floor of Pokémon Centers."))
+end
+