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Got it. This is a bitch of a puzzle, as it requires specific move sets. For the first part you need to lower all the stats of the shedinja to -6 and hit it with a status effect Then lose. The second you need to setup trick room, psychic terrain and hit the shedinja with encore before killing yourself with all 3 still active. Finally you need to hit the shedinja with attact, then active destiny bond and die to it's attack for the final part.