Fixed using pkmn.species= with a form's internal name not setting the actual species. Fixed Shadow Pokémon not being able to have different Shadow Moves for particular forms.

Data/Scripts/016_Pokemon/001_PokeBattle_Pokemon.rb

@@ -629,7 +629,7 @@ class PokeBattle_Pokemon
   #=============================================================================
   def species=(value)
     hasNickname = nicknamed?
-    @species    = value
+    @species, @form = pbGetSpeciesFromFSpecies(value)
     @name       = PBSpecies.getName(@species) unless hasNickname
     @level      = nil   # In case growth rate is different for the new species
     @forcedForm = nil

Data/Scripts/016_Pokemon/004_Pokemon_ShadowPokemon.rb

@@ -290,12 +290,14 @@ class PokeBattle_Pokemon
     self.savedev     = [0,0,0,0,0,0]
     self.shadowmoves = [0,0,0,0,0,0,0,0]
     # Retrieve shadow moves
-    moves = pbLoadShadowMovesets
-    if moves[self.species] && moves[self.species].length>0
-      for i in 0...[4,moves[self.species].length].min
-        self.shadowmoves[i] = moves[self.species][i]
+    shadow_movesets = pbLoadShadowMovesets
+    shadow_moves = shadow_movesets[self.fSpecies]
+    shadow_moves = shadow_movesets[self.species] if !shadow_moves || shadow_moves.length == 0
+    if shadow_moves && shadow_moves.length > 0
+      for i in 0...[4,shadow_moves.length].min
+        self.shadowmoves[i] = shadow_moves[i]
       end
-      self.shadowmovenum = moves[self.species].length
+      self.shadowmovenum = shadow_moves.length
     else
       # No special shadow moves
       self.shadowmoves[0] = getConst(PBMoves,:SHADOWRUSH) || 0

Data/Scripts/021_Debug/005_Editor_SaveData.rb

@@ -1336,7 +1336,7 @@ end
 # Save Shadow move data to PBS file
 #===============================================================================
 def pbSaveShadowMoves
-  moves = pbLoadShadowMovesets
+  shadow_movesets = pbLoadShadowMovesets
   File.open("PBS/shadowmoves.txt","wb") { |f|
     f.write(0xEF.chr)
     f.write(0xBB.chr)
@@ -1344,14 +1344,14 @@ def pbSaveShadowMoves
     f.write("\# "+_INTL("See the documentation on the wiki to learn how to edit this file."))
     f.write("\r\n")
     f.write("\#-------------------------------\r\n")
-    for i in 0...moves.length
-      move = moves[i]
-      next if !move || moves.length==0
+    for i in 0...shadow_movesets.length
+      moveset = shadow_movesets[i]
+      next if !moveset || moveset.length==0
       constname = (getConstantName(PBSpecies,i) rescue pbGetSpeciesConst(i) rescue nil)
       next if !constname
       f.write(sprintf("%s = ",constname))
       movenames = []
-      for m in move
+      for m in moveset
         movenames.push((getConstantName(PBMoves,m) rescue pbGetMoveConst(m) rescue nil))
       end
       f.write(sprintf("%s\r\n",movenames.compact.join(",")))