Only Giratina can learn shadow force. The only thing that proves or said that Giratina can learn the move is because it is it's signature move.....
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Most Pokemon can learn that move think of it this way Pokemon that have hands can learn it some Pokemon learn it from the move tutors however some can learn it via egg move only.
Shadow Force
Giratina's signature move is Shadow Force.
Any Pokemon that can learn a electric move
shadow force only giritina knows this move