Pues, ahora traigo este Script de Yanfly.
que es otra forma de crecimiento de parametros.

Código:

#==============================================================================
#
# ▼ Yanfly Engine Ace - Parameter Bonus Growth v1.00
# -- Last Updated: 2012.01.25
# -- Level: Normal
# -- Requires: n/a
#
#==============================================================================

$imported = {} if $imported.nil?
$imported["YEA-ParameterBonusGrowth"] = true

#==============================================================================
# ▼ Updates
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# 2012.01.25 - Started Script and Finished.
#
#==============================================================================
# ▼ Introduction
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# This script provides a new custom trait for actors, classes, equipment, and
# even states. When an actor levels up with a parameter growth trait, they will
# permanently gain a bonus to that particular parameter. These bonuses are
# maintained even upon switching classes.
#
# Note: Starting a new game with characters above level 1 does not trigger any
# stat growth bonuses.
#
#==============================================================================
# ▼ Instructions
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# To install this script, open up your script editor and copy/paste this script
# to an open slot below ▼ Materials/素材 but above ▼ Main. Remember to save.
#
# -----------------------------------------------------------------------------
# Actor Notetags - These notetags go in the actors notebox in the database.
# -----------------------------------------------------------------------------
# <stat growth: +x>
# <stat growth: -x>
# This causes the stat to grow by +x or -x upon the actor leveling up. All stat
# growth bonuses are cumulative across anything that provides this trait. x can
# be either an integer or a decimal. Replace stat with one of the following:
# MAXHP, MAXMP, ATK, DEF, MAT, MDF, AGI, LUK
#
# -----------------------------------------------------------------------------
# Class Notetags - These notetags go in the classes notebox in the database.
# -----------------------------------------------------------------------------
# <stat growth: +x>
# <stat growth: -x>
# This causes the stat to grow by +x or -x upon the actor leveling up. All stat
# growth bonuses are cumulative across anything that provides this trait. x can
# be either an integer or a decimal. Replace stat with one of the following:
# MAXHP, MAXMP, ATK, DEF, MAT, MDF, AGI, LUK
#
# -----------------------------------------------------------------------------
# Weapon Notetags - These notetags go in the weapons notebox in the database.
# -----------------------------------------------------------------------------
# <stat growth: +x>
# <stat growth: -x>
# This causes the stat to grow by +x or -x upon the actor leveling up. All stat
# growth bonuses are cumulative across anything that provides this trait. x can
# be either an integer or a decimal. Replace stat with one of the following:
# MAXHP, MAXMP, ATK, DEF, MAT, MDF, AGI, LUK
#
# -----------------------------------------------------------------------------
# Armour Notetags - These notetags go in the armours notebox in the database.
# -----------------------------------------------------------------------------
# <stat growth: +x>
# <stat growth: -x>
# This causes the stat to grow by +x or -x upon the actor leveling up. All stat
# growth bonuses are cumulative across anything that provides this trait. x can
# be either an integer or a decimal. Replace stat with one of the following:
# MAXHP, MAXMP, ATK, DEF, MAT, MDF, AGI, LUK
#
# -----------------------------------------------------------------------------
# State Notetags - These notetags go in the states notebox in the database.
# -----------------------------------------------------------------------------
# <stat growth: +x>
# <stat growth: -x>
# This causes the stat to grow by +x or -x upon the actor leveling up. All stat
# growth bonuses are cumulative across anything that provides this trait. x can
# be either an integer or a decimal. Replace stat with one of the following:
# MAXHP, MAXMP, ATK, DEF, MAT, MDF, AGI, LUK
#
#==============================================================================
# ▼ Compatibility
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# This script is made strictly for RPG Maker VX Ace. It is highly unlikely that
# it will run with RPG Maker VX without adjusting.
#
#==============================================================================
# ▼ Editting anything past this point may potentially result in causing
# computer damage, incontinence, explosion of user's head, coma, death, and/or
# halitosis so edit at your own risk.
#==============================================================================

module YEA
  module REGEXP
  module BASEITEM
   
    PARAM_GROWTH = /<(.*)[ ](?:GROWTH|growth):[ ]\s*([-+]?\d+\.?\d*)>/i
   
  end # BASEITEM
  end # REGEXP
end # YEA

#==============================================================================
# ■ DataManager
#==============================================================================

module DataManager
 
  #--------------------------------------------------------------------------
  # alias method: load_database
  #--------------------------------------------------------------------------
  class <<self; alias load_database_pbg load_database; end
  def self.load_database
    load_database_pbg
    load_notetags_pbg
  end
 
  #--------------------------------------------------------------------------
  # new method: load_notetags_pbg
  #--------------------------------------------------------------------------
  def self.load_notetags_pbg
    groups = [$data_actors, $data_classes, $data_weapons, $data_armors,
      $data_states]
    for group in groups
      for obj in group
        next if obj.nil?
        obj.load_notetags_pbg
      end
    end
  end
 
end # DataManager

#==============================================================================
# ■ RPG::BaseItem
#==============================================================================

class RPG::BaseItem
 
  #--------------------------------------------------------------------------
  # public instance variables
  #--------------------------------------------------------------------------
  attr_accessor :param_bonus_growth
 
  #--------------------------------------------------------------------------
  # common cache: load_notetags_pbg
  #--------------------------------------------------------------------------
  def load_notetags_pbg
    @param_bonus_growth = [0.0] * 8
    #---
    self.note.split(/[\r\n]+/).each { |line|
      case line
      #---
      when YEA::REGEXP::BASEITEM::PARAM_GROWTH
        case $1.upcase
        when "HP", "MAXHP", "MHP"
          @param_bonus_growth[0] = $2.to_f
        when "MP", "MAXMP", "MMP", "SP", "MAXSP", "MSP"
          @param_bonus_growth[1] = $2.to_f
        when "ATK"
          @param_bonus_growth[2] = $2.to_f
        when "DEF"
          @param_bonus_growth[3] = $2.to_f
        when "MAT", "INT", "SPI"
          @param_bonus_growth[4] = $2.to_f
        when "MDF", "RES"
          @param_bonus_growth[5] = $2.to_f
        when "AGI", "SPD"
          @param_bonus_growth[6] = $2.to_f
        when "LUK", "LUCK"
          @param_bonus_growth[7] = $2.to_f
        end
      end
    } # self.note.split
    #---
  end
 
end # RPG::BaseItem

#==============================================================================
# ■ Game_BattlerBase
#==============================================================================

class Game_BattlerBase
 
  #--------------------------------------------------------------------------
  # new method: param_bonus_growth
  #--------------------------------------------------------------------------
  def param_bonus_growth(param_id)
    n = 0.0
    if actor?
      n += self.actor.param_bonus_growth[param_id]
      n += self.class.param_bonus_growth[param_id]
      for equip in equips
        next if equip.nil?
        n += equip.param_bonus_growth[param_id]
      end
    end
    for state in states
      next if state.nil?
      n += state.param_bonus_growth[param_id]
    end
    return n
  end
 
end # Game_BattlerBase

#==============================================================================
# ■ Game_Actor
#==============================================================================

class Game_Actor < Game_Battler
 
  #--------------------------------------------------------------------------
  # alias method: level_up
  #--------------------------------------------------------------------------
  alias game_actor_level_up_pbg level_up
  def level_up
    last_level = @level
    game_actor_level_up_pbg
    apply_param_bonus_growth if last_level != @level
  end
 
  #--------------------------------------------------------------------------
  # alias method: level_down
  #--------------------------------------------------------------------------
  alias game_actor_level_down_pbg level_down
  def level_down
    last_level = @level
    game_actor_level_down_pbg
    apply_param_bonus_growth(-1) if last_level != @level
  end
 
  #--------------------------------------------------------------------------
  # new method: apply_param_bonus_growth
  #--------------------------------------------------------------------------
  def apply_param_bonus_growth(rate = 1)
    for i in 0...8 do @param_plus[i] += param_bonus_growth(i) * rate end
  end
 
end # Game_Actor

#==============================================================================
#
# ▼ End of File
#
#==============================================================================

Pueden escribir esto en nota de Actor, Clases, Armas y armaduras:
<stat growth: +x>
<stat growth: -x>
y cambian stat por:
MAXHP, MAXMP, ATK, DEF, MAT, MDF, AGI, LUK
Cada vez que suba de nivel subirán estos parametros que hayan establecido. Pueden usar decimales.
ej:

<AGI growth: +5.4>
entonces cada vez que suba de nivel aumenta en 5.4 su AGI. y se acumulan sus decimales hasta hacer un número entero

Me encanta este Script.
Normalmente es uno de los que uso de Yanfly.
Ahora cuando lo pierda estará en un lugar de Búsqueda facil.

Muy bueno me gusta mucho +1!!!

wow s3 exelente script sige asi, y mas por que me gustan los scripts de yanfly channel xd.
saludos ^^

Voy a ver que tal esta gracias.

Sayounara!