For a limited time, players can receive a free Shadow Mewtwo amiibo card with their Nintendo eShop digital purchase of the Pokkén Tournament game. The offer expires July 31, 2016 and is only valid in US, Canada, and Mexico while supplies last and there is a limit of one amiibo card per purchase.
In order to expedite your order, please carefully follow the instructions below.
1. Register for Nintendo Store. This is how Nintendo makes sure that your shipping address in their system.
- If you have registered before, please make sure that they have your recent shipping address by signing in to update your profile.
- If you live in the US, click here.
- If you live in Canada, click here.
- If you live in Mexico, click here to contact us.
2. Email Nintendo's support team. In order to qualify for this free offer, Nintendo needs to verify your purchase history to confirm that Pokkén Tournament has been purchased. You'll be asked for the following information:
- Email address - be sure to use the same email address you provided in your Nintendo Store registration from step 1.
- Nintendo Network ID
- Serial Number
- To email Nintendo, click here.
Wait for Nintendo to review and process your request. After they confirm your Nintendo eShop purchase, they'll reply to your email with shipping information for your order. Please allow up to two weeks for processing time.
Source:
http://en-americas-support.nintendo.com/app/answers/detail/a_id/16523/~/shadow-mewtwo-amiibo-card-offer-for-pokk%C3%A9n-tournament