Added effects of Mimicry/Room Service/Catching Charm, tweaked Sinistea's form chances, fixed bug in Fling about TRs.

Data/Scripts/011_Battle/001_Battler/003_Battler_ChangeSelf.rb

@@ -127,6 +127,14 @@ class PokeBattle_Battler
     @effects[PBEffects::Roost]  = false
   end
 
+  def pbResetTypes
+    @type1 = @pokemon.type1
+    @type2 = @pokemon.type2
+    @effects[PBEffects::Type3]  = nil
+    @effects[PBEffects::BurnUp] = false
+    @effects[PBEffects::Roost]  = false
+  end
+
   #=============================================================================
   # Forms
   #=============================================================================

Data/Scripts/011_Battle/001_Battler/006_Battler_AbilityAndItem.rb

@@ -61,6 +61,17 @@ class PokeBattle_Battler
     return ret   # Whether self has switched out
   end
 
+  def pbAbilityOnTerrainChange(ability_changed = false)
+    return if !abilityActive?
+    BattleHandlers.triggerAbilityOnTerrainChange(self.ability, self, @battle, ability_changed)
+  end
+
+  # Used for Rattled's Gen 8 effect. Called when Intimidate is triggered.
+  def pbAbilitiesOnIntimidated
+    return if !abilityActive?
+    BattleHandlers.triggerAbilityOnIntimidated(self.ability, self, @battle)
+  end
+
   # Called when a Pokémon (self) enters battle, at the end of each move used,
   # and at the end of each round.
   def pbContinualAbilityChecks(onSwitchIn=false)
@@ -91,12 +102,6 @@ class PokeBattle_Battler
     end
   end
 
-  # Used for Rattled's Gen 8 effect. Called when Intimidate is triggered.
-  def pbAbilitiesOnIntimidated
-    return if !abilityActive?
-    BattleHandlers.triggerAbilityOnIntimidated(self.ability, self, @battle)
-  end
-
   #=============================================================================
   # Ability curing
   #=============================================================================
@@ -123,6 +128,8 @@ class PokeBattle_Battler
     @effects[PBEffects::SlowStart]  = 0 if self.ability != :SLOWSTART
     # Revert form if Flower Gift/Forecast was lost
     pbCheckFormOnWeatherChange(true)
+    # Abilities that trigger when the terrain changes
+    pbAbilityOnTerrainChange(true)
     # Check for end of primordial weather
     @battle.pbEndPrimordialWeather
   end

Data/Scripts/011_Battle/001_Battler/007_Battler_UseMove.rb

@@ -366,7 +366,7 @@ class PokeBattle_Battler
         @battle.pbShowAbilitySplash(user)
         user.pbChangeTypes(move.calcType)
         typeName = GameData::Type.get(move.calcType).name
-        @battle.pbDisplay(_INTL("{1} transformed into the {2} type!",user.pbThis,typeName))
+        @battle.pbDisplay(_INTL("{1}'s type changed to {2}!",user.pbThis,typeName))
         @battle.pbHideAbilitySplash(user)
         # NOTE: The GF games say that if Curse is used by a non-Ghost-type
         #       Pokémon which becomes Ghost-type because of Protean, it should

Data/Scripts/011_Battle/001_Battler/010_Battler_UseMove_TriggerEffects.rb

@@ -144,6 +144,16 @@ class PokeBattle_Battler
       #       after the move's animation, but the item is only consumed now.
       user.pbConsumeItem
     end
+    # Room Service
+    if move.function == "11F" && @battle.field.effects[PBEffects::TrickRoom] > 0   # Trick Room
+      @battle.battlers.each do |b|
+        next if !b.hasActiveItem?(:ROOMSERVICE)
+        next if !b.pbCanLowerStatStage?(:SPEED, b)
+        @battle.pbCommonAnimation("UseItem", b)
+        b.pbLowerStatStage(:SPEED, 1, b)
+        b.pbConsumeItem
+      end
+    end
     # Pokémon switching caused by Roar, Whirlwind, Circle Throw, Dragon Tail
     switchedBattlers = []
     move.pbSwitchOutTargetsEffect(user,targets,numHits,switchedBattlers)