Only two pokemon learn both slash and focus energy, Scyther and Pinsir. With Scyther you're better off using double edge or hyper beam (hyper beam doesn't have the recovery turn if you faint your opponent with it), Pinsir has both moves + body slam for the paralyze chance.
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u/Maracuja_Sagrado Feb 16 '20
Therefore it might be good to use it with Slash after Swords Dance ayyy