Resolved many Rubocop warnings

Data/Scripts/012_Battle/001_Battler/001_PokeBattle_Battler.rb

@@ -351,7 +351,6 @@ class PokeBattle_Battler
        :COMATOSE,
        :RKSSYSTEM
     ]
-    failed = false
     abilityBlacklist.each do |abil|
       return true if isConst?(@ability,PBAbilities,abil)
     end

Data/Scripts/012_Battle/001_Battler/003_Battler_ChangeSelf.rb

@@ -31,7 +31,6 @@ class PokeBattle_Battler
 
   def pbRecoverHPFromDrain(amt,target,msg=nil)
     if target.hasActiveAbility?(:LIQUIDOOZE)
-      oldHP = @hp
       @battle.pbShowAbilitySplash(target)
       pbReduceHP(amt)
       @battle.pbDisplay(_INTL("{1} sucked up the liquid ooze!",pbThis))

Data/Scripts/012_Battle/001_Battler/004_Battler_Statuses.rb

@@ -566,7 +566,7 @@ class PokeBattle_Battler
   #=============================================================================
   # Flinching
   #=============================================================================
-  def pbFlinch(user=nil)
+  def pbFlinch(_user=nil)
     return if hasActiveAbility?(:INNERFOCUS) && !@battle.moldBreaker
     @effects[PBEffects::Flinch] = true
   end

Data/Scripts/012_Battle/001_Battler/006_Battler_AbilityAndItem.rb

@@ -149,7 +149,7 @@ class PokeBattle_Battler
   #=============================================================================
   # Held item consuming/removing
   #=============================================================================
-  def pbCanConsumeBerry?(item,alwaysCheckGluttony=true)
+  def pbCanConsumeBerry?(_item,alwaysCheckGluttony=true)
     return false if @battle.pbCheckOpposingAbility(:UNNERVE,@index)
     return true if @hp<=@totalhp/4
     if alwaysCheckGluttony || NEWEST_BATTLE_MECHANICS

Data/Scripts/012_Battle/001_Battler/007_Battler_UseMove.rb

@@ -67,7 +67,7 @@ class PokeBattle_Battler
   #=============================================================================
   #
   #=============================================================================
-  def pbBeginTurn(choice)
+  def pbBeginTurn(_choice)
     # Cancel some lingering effects which only apply until the user next moves
     @effects[PBEffects::BeakBlast]           = false
     @effects[PBEffects::DestinyBondPrevious] = @effects[PBEffects::DestinyBond]
@@ -105,7 +105,7 @@ class PokeBattle_Battler
     @effects[PBEffects::FuryCutter]    = 0
   end
 
-  def pbEndTurn(choice)
+  def pbEndTurn(_choice)
     @lastRoundMoved = @battle.turnCount   # Done something this round
     if @effects[PBEffects::ChoiceBand]<0 &&
        hasActiveItem?([:CHOICEBAND,:CHOICESPECS,:CHOICESCARF])
@@ -438,7 +438,6 @@ class PokeBattle_Battler
         # NOTE: If a multi-hit move becomes disabled partway through doing those
         #       hits (e.g. by Cursed Body), the rest of the hits continue as
         #       normal.
-        notFainted = false
         break if !targets.any? { |t| !t.fainted? }   # All targets are fainted
       end
       # Battle Arena only - attack is successful
@@ -479,7 +478,7 @@ class PokeBattle_Battler
         newTargets = pbChangeTargets(move,b,newTargets)
         success = pbProcessMoveHit(move,b,newTargets,0,false)
         b.lastMoveFailed = true if !success
-        targets.each { |b| b.pbFaint if b && b.fainted? }
+        targets.each { |otherB| otherB.pbFaint if otherB && otherB.fainted? }
         user.pbFaint if user.fainted?
       end
       # Magic Coat's bouncing back (move has no targets)

Data/Scripts/012_Battle/001_Battler/008_Battler_UseMove_Targeting.rb

@@ -2,7 +2,7 @@ class PokeBattle_Battler
   #=============================================================================
   # Get move's user
   #=============================================================================
-  def pbFindUser(choice,move)
+  def pbFindUser(_choice,_move)
     return self
   end
 
@@ -169,7 +169,7 @@ class PokeBattle_Battler
     return true
   end
 
-  def pbAddTargetRandomAlly(targets,user,move,nearOnly=true)
+  def pbAddTargetRandomAlly(targets,user,_move,nearOnly=true)
     choices = []
     user.eachAlly do |b|
       next if nearOnly && !user.near?(b)
@@ -180,7 +180,7 @@ class PokeBattle_Battler
     end
   end
 
-  def pbAddTargetRandomFoe(targets,user,move,nearOnly=true)
+  def pbAddTargetRandomFoe(targets,user,_move,nearOnly=true)
     choices = []
     user.eachOpposing do |b|
       next if nearOnly && !user.near?(b)

Data/Scripts/012_Battle/001_Battler/009_Battler_UseMove_SuccessChecks.rb

@@ -136,7 +136,7 @@ class PokeBattle_Battler
       @battle.pbDisplay(_INTL("{1} ignored orders!",pbThis))
       return false if !@battle.pbCanShowFightMenu?(@index)
       otherMoves = []
-      eachMoveWithIndex do |m,i|
+      eachMoveWithIndex do |_m,i|
         next if i==choice[1]
         otherMoves[otherMoves.length] = i if @battle.pbCanChooseMove?(@index,i,false)
       end