ami² lets you easily duplicate your Amiibos.
moriczgergo has released a neat homebrew utility for the 3DS handheld that allows you to easy copy the same Amiibo character, or even a different one. You can use this easy tool to have two identical Amiibos, or to see what moves other characters have in SSB, etc.
For more info, check out the release thread below for support, etc.:
NEWS SOURCE: ami² - Amiibo Duplicator (via) GBATemp