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Boosts the user's Attack by one stage.
Sharpen is a horrible move. It has incredibly limited distribution, being only known by the Porygon line and Cryogonal. None of the four Pokemon with access to Sharpen should ever bother with a physical attacking set, as they all have low Attack stats. Porygon2 should stick with being an offensive wall, Porygon-Z should stick with being a special sweeper, and Cryogonal should stick with being a specially defensive Rapid Spin user.
Howl is an equivalent.
Meditate is a Psychic-type equivalent.
Swords Dance is a variant that boosts the user's Attack stat by two stages.