Fixed error when shifting Pokémon at the end of a battle round, fixed Giratina's form code crashing if the current map doesn't have metadata, fixed item sell prices being halved twice

Data/Scripts/011_Battle/001_Battle/011_Battle_EndOfRoundPhase.rb

@@ -579,7 +579,7 @@ class Battle
       swaps.each do |pair|
         next if pbSideSize(pair[0]) == 2 && swaps.length > 1
         next if !pbSwapBattlers(pair[0], pair[1])
-        case pbSideSize(side)
+        case pbSideSize(pair[1])
         when 2
           pbDisplay(_INTL("{1} moved across!", @battlers[pair[1]].pbThis))
         when 3

Data/Scripts/014_Pokemon/001_Pokemon-related/001_FormHandlers.rb

@@ -260,8 +260,7 @@ MultipleForms.register(:ROTOM, {
 MultipleForms.register(:GIRATINA, {
   "getForm" => proc { |pkmn|
     next 1 if pkmn.hasItem?(:GRISEOUSORB)
-    if $game_map &&
-       GameData::MapMetadata.get($game_map.map_id)&.has_flag?("DistortionWorld")
+    if $game_map && $game_map.metadata&.has_flag?("DistortionWorld")
       next 1
     end
     next 0

Data/Scripts/016_UI/020_UI_PokeMart.rb

@@ -460,7 +460,6 @@ class PokemonMart_Scene
     ret = 0
     helpwindow = @sprites["helpwindow"]
     itemprice = @adapter.getPrice(item, !@buying)
-    itemprice /= 2 if !@buying
     pbDisplay(helptext, true)
     using(numwindow = Window_AdvancedTextPokemon.new("")) do   # Showing number of items
       pbPrepareWindow(numwindow)
@@ -681,7 +680,6 @@ class PokemonMartScreen
         @scene.pbHideMoney
         next
       end
-      price /= 2
       price *= qty
       if pbConfirm(_INTL("I can pay ${1}.\nWould that be OK?", price.to_s_formatted))
         old_money = @adapter.getMoney