Introduced in Generation I as Exp.All, later renamed Exp.Share. In Generation I, it halves battle experience for all party members. In Generation II, it splits fainted battle experience between party members. From Generation III to V, it continues to split fainted battle experience. In Generation VI-VII, it became a Key Item that can be turned on/off
Lessons learned involve documenting and sharing experiences through documents, presentations, and discussions. Sharing both successes and failures yields greater benefits than just successes. Enables better decision making based on actual experience. Helps avoid repeating mistakes and prevent future disasters