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This belongs in RGSS Support.. now where is Raziel...
Just use
Code:
actor = $game_party.actors[actor_index]
or
actor = $game_actors[actor_id]
actor.learn_skill(skill_id)
The first one will get the actor from the party based off its positon (0 being first and the second will get the actor from $game_actors, which are just a list of the actors from the database.