The Japanese Pokémon Centers have begun selling a Silicon Band (シリコンバンド)
as part of the Pokémon with YOU Pokémon Christmas Party 2014 (ポケモンクリスマスパーティ2014)
campaign. People that purchase a band for 400yen will receive a card with a serial number to redeem a Jirachi. Jirachi will be redeemable from December 1st, 2014 until May 28th, 2015
for players of the Japanese versions of Pokémon X and Y
and Pokémon Omega Ruby and Alpha Sapphire
. The bands come in two colors: Green and Orange and in two sizes: Small and Medium.
Scan Source: http://d.hatena.ne.jp/asami-1120/20141101