The official Japanese Pokémon website announced that the
Weakness Policy (じゃくてんほけん) will be distributed at Jump Festa '14 (ジャンプフェスタ '14) which takes place at the
Makuhari Messe International Exhibition Hall (幕張メッセ 国際展示場 ) on December 21st, 2013 and December 22nd, 2013. The Weakness Policy will be available to players of Pokémon X and Y that visit Jump Festa '14.
A Battle Festival for Pokémon X and Y will also be taking place at Jump Festa '14. Anyone can join and prior registration is not required. Full details of the battle rules will be announced at a future time.
Source:
http://www.pokemon.co.jp/info/2013/10/131025_g01.html