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Air Slash doesn't seem worth it, because Aerial Ace OHKOES Buzzwole at +2, and you can go full Attack then - no need for all that Special Attack investment with a hindering nature.
TSV Check Request
In-Game Name: Michael
Friend Code: 3540-5777-1340
Generation: 6
Time Zone: GMT+3
Add to the TSV list in the first post once found: Yes
Willingness to hatch: At my discretion