Fixed error in Powder's backfire message, fixed move disruption affecting recharge moves when it shouldn't, fixed error when Shell Side Arm has no targets, fixed AI not unregistering Mega Evolution if it won't do so after all

Data/Scripts/011_Battle/002_Battler/007_Battler_UseMove.rb

@@ -89,7 +89,7 @@ class Battle::Battler
     @effects[PBEffects::Outrage]       = 0
     @effects[PBEffects::Uproar]        = 0
     @effects[PBEffects::Bide]          = 0
-    @currentMove = nil
+    @currentMove = nil if @effects[PBEffects::HyperBeam] == 0
     # Reset counters for moves which increase them when used in succession
     @effects[PBEffects::FuryCutter] = 0
   end
@@ -314,7 +314,7 @@ class Battle::Battler
       user.lastMoveFailed = true
       if ![:Rain, :HeavyRain].include?(user.effectiveWeather) && user.takesIndirectDamage?
         user.pbTakeEffectDamage((user.totalhp / 4.0).round, false) do |hp_lost|
-          @battle.pbDisplay(_INTL("{1} is hurt by its {2}!", battler.pbThis, battler.itemName))
+          @battle.pbDisplay(_INTL("{1} is hurt by Powder!", user.pbThis))
         end
         @battle.pbGainExp   # In case user is KO'd by this
       end