Added checks that prevent aliasing a method if the alias method already exists, fixed Symbiosis not working properly for opponents

Data/Scripts/011_Battle/002_Battler/006_Battler_AbilityAndItem.rb

@@ -236,7 +236,7 @@ class Battle::Battler
     return if fainted?
     return if self.item
     @battle.pbPriority(true).each do |b|
-      next if b.opposes?
+      next if b.opposes?(self)
       next if !b.hasActiveAbility?(:SYMBIOSIS)
       next if !b.item || b.unlosableItem?(b.item)
       next if unlosableItem?(b.item)

Data/Scripts/011_Battle/006_Other battle code/006_Battle_Clauses.rb

@@ -103,7 +103,9 @@ end
 
 
 class Battle::Move::RaiseUserEvasion1   # Double Team
-  alias __clauses__pbMoveFailed? pbMoveFailed?
+  unless method_defined?(:__clauses__pbMoveFailed?)
+    alias __clauses__pbMoveFailed? pbMoveFailed?
+  end
 
   def pbMoveFailed?(user, targets)
     if !damagingMove? && @battle.rules["evasionclause"]
@@ -117,7 +119,9 @@ end
 
 
 class Battle::Move::RaiseUserEvasion2MinimizeUser   # Minimize
-  alias __clauses__pbMoveFailed? pbMoveFailed?
+  unless method_defined?(:__clauses__pbMoveFailed?)
+    alias __clauses__pbMoveFailed? pbMoveFailed?
+  end
 
   def pbMoveFailed?(user, targets)
     if !damagingMove? && @battle.rules["evasionclause"]
@@ -131,7 +135,9 @@ end
 
 
 class Battle::Move::UserTargetSwapAbilities   # Skill Swap
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["skillswapclause"]
@@ -145,7 +151,9 @@ end
 
 
 class Battle::Move::FixedDamage20   # Sonic Boom
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["sonicboomclause"]
@@ -159,7 +167,9 @@ end
 
 
 class Battle::Move::FixedDamage40   # Dragon Rage
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["sonicboomclause"]
@@ -173,7 +183,9 @@ end
 
 
 class Battle::Move::OHKO
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["ohkoclause"]
@@ -187,7 +199,9 @@ end
 
 
 class Battle::Move::OHKOIce
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["ohkoclause"]
@@ -201,7 +215,9 @@ end
 
 
 class Battle::Move::OHKOHitsUndergroundTarget
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["ohkoclause"]
@@ -215,9 +231,8 @@ end
 
 
 class Battle::Move::UserFaintsExplosive   # Self-Destruct
-  unless @__clauses__aliased
+  unless method_defined?(:__clauses__pbMoveFailed?)
     alias __clauses__pbMoveFailed? pbMoveFailed?
-    @__clauses__aliased = true
   end
 
   def pbMoveFailed?(user, targets)
@@ -247,7 +262,9 @@ end
 
 
 class Battle::Move::StartPerishCountsForAllBattlers   # Perish Song
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["perishsongclause"] &&
@@ -262,7 +279,9 @@ end
 
 
 class Battle::Move::AttackerFaintsIfUserFaints   # Destiny Bond
-  alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  unless method_defined?(:__clauses__pbFailsAgainstTarget?)
+    alias __clauses__pbFailsAgainstTarget? pbFailsAgainstTarget?
+  end
 
   def pbFailsAgainstTarget?(user, target, show_message)
     if @battle.rules["perishsongclause"] &&

Data/Scripts/011_Battle/007_Other battle types/001_SafariBattle.rb

@@ -272,7 +272,8 @@ class Battle::Scene
     rockAnim.dispose
   end
 
-  alias __safari__pbThrowSuccess pbThrowSuccess
+  alias __safari__pbThrowSuccess pbThrowSuccess unless method_defined?(:__safari__pbThrowSuccess)
+
   def pbThrowSuccess
     __safari__pbThrowSuccess
     pbWildBattleSuccess if @battle.is_a?(SafariBattle)

Data/Scripts/011_Battle/007_Other battle types/002_BugContestBattle.rb

@@ -2,7 +2,7 @@
 # Bug Catching Contest battle scene (the visuals of the battle)
 #===============================================================================
 class Battle::Scene
-  alias _bugContest_pbInitSprites pbInitSprites
+  alias _bugContest_pbInitSprites pbInitSprites unless method_defined?(:_bugContest_pbInitSprites)
 
   def pbInitSprites
     _bugContest_pbInitSprites

Data/Scripts/011_Battle/007_Other battle types/003_BattlePalaceBattle.rb

@@ -172,14 +172,16 @@ end
 class Battle::AI
   attr_accessor :battlePalace
 
-  alias _battlePalace_initialize initialize
+  alias _battlePalace_initialize initialize unless method_defined?(:_battlePalace_initialize)
 
   def initialize(*arg)
     _battlePalace_initialize(*arg)
     @justswitched = [false, false, false, false]
   end
 
-  alias _battlePalace_pbEnemyShouldWithdraw? pbEnemyShouldWithdraw?
+  unless method_defined?(:_battlePalace_pbEnemyShouldWithdraw?)
+    alias _battlePalace_pbEnemyShouldWithdraw? pbEnemyShouldWithdraw?
+  end
 
   def pbEnemyShouldWithdraw?(idxBattler)
     return _battlePalace_pbEnemyShouldWithdraw?(idxBattler) if !@battlePalace

Data/Scripts/011_Battle/007_Other battle types/004_BattleArenaBattle.rb

@@ -211,7 +211,9 @@ end
 class Battle::AI
   attr_accessor :battleArena
 
-  alias _battleArena_pbEnemyShouldWithdraw? pbEnemyShouldWithdraw?
+  unless method_defined?(:_battleArena_pbEnemyShouldWithdraw?)
+    alias _battleArena_pbEnemyShouldWithdraw? pbEnemyShouldWithdraw?
+  end
 
   def pbEnemyShouldWithdraw?(idxBattler)
     return _battleArena_pbEnemyShouldWithdraw?(idxBattler) if !@battleArena