Fixed changing a Pokémon's form with an item not doing certain things, fixed alternate forms not inheriting certain properties from the base form

Data/Scripts/014_Pokemon/001_Pokemon.rb

@@ -139,6 +139,18 @@ class Pokemon
   end
 
   def form=(value)
+    oldForm = @form
+    @form = value
+    @ability = nil
+    MultipleForms.call("onSetForm", self, value, oldForm)
+    calc_stats
+    $Trainer.pokedex.register(self)
+  end
+
+  # The same as def form=, but yields to a given block in the middle so that a
+  # message about the form changing can be shown before calling "onSetForm"
+  # which may have its own messages, e.g. learning a move.
+  def setForm(value)
     oldForm = @form
     @form = value
     @ability = nil

Data/Scripts/014_Pokemon/006_Pokemon_Deprecated.rb

@@ -171,7 +171,6 @@ class Pokemon
   deprecated_method_alias :isAble?, :able?, removal_in: 'v20'
   deprecated_method_alias :isFainted?, :fainted?, removal_in: 'v20'
   deprecated_method_alias :isShiny?, :shiny?, removal_in: 'v20'
-  deprecated_method_alias :setForm, :form=, removal_in: 'v20'
   deprecated_method_alias :setGender, :gender=, removal_in: 'v20'
   deprecated_method_alias :isMale?, :male?, removal_in: 'v20'
   deprecated_method_alias :isFemale?, :female?, removal_in: 'v20'