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

Data/Scripts/012_Overworld/002_Battle triggering/001_Overworld_BattleStarting.rb

@@ -340,8 +340,12 @@ def pbWildBattle(species, level, outcomeVar=1, canRun=true, canLose=false)
   dexnum = getDexNumberForSpecies(species)
   if $game_switches[SWITCH_RANDOM_STATIC_ENCOUNTERS] && dexnum <= NB_POKEMON
     newSpecies = $PokemonGlobal.psuedoBSTHash[dexnum]
+    if !newSpecies
+      displayRandomizerErrorMessage()
+    else
       species = getSpecies(newSpecies)
     end
+  end
 
   # Potentially call a different pbWildBattle-type method instead (for roaming
   # Pokémon, Safari battles, Bug Contest battles)

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
+

Data/Scripts/050_AddOns/Trainers Rebattle.rb

@@ -214,8 +214,7 @@ def getFusionSpeciesSymbol(body, head)
   nb_pokemon = Settings::NB_POKEMON
   id = body_num * nb_pokemon + head_num
   if id > (nb_pokemon*nb_pokemon)+nb_pokemon
-    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."))
+    displayRandomizerErrorMessage()
     return body
   end