The official Japanese Pokémon website has announced the special offers for those that pre-order the Japanese versions of Pokémon Omega Ruby and Pokémon Alpha Sapphire at a Pokémon Center. Starting on September 20th, 2014, in addition to the Groudon and Kyogre model figures, those that pre-order either game will also get a Super Shining Primal Groudon or Primal Kyogre underlay.

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Those that pre-order both games for 9,142yen plus tax will also receive the New Hoenn ART Book (ニュー ホウエン アートブック).

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Players that purchase the special game double pack will also receive a two serial codes to unlock 100 Potions.

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Sources: http://www.pokemon.co.jp/info/2014/09/140904_p01.html and http://www.4gamer.net/games/256/G025650/20140904042/