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On the index page of this Smog issue, the date released is stated to be February 5, 2012 instead of 2013.
sandz edit: fixed!!! Thanks ^_^ wow lol this happened last year too :d
Mamoswine should definitely have Superpower over Stone Edge. In addition, l would suggest running an EV spread of Max HP, Max Atk, and 4 Speed on Mamoswine, as Mamoswine can take hits quite well with the HP investment.