According to a tweet by CapcomUK, the Gold Mega Man amiibo that will be released exclusively in the Mega Man Legacy Collection is also a North American exclusive, for now.

In our experience with amiibos, we know that the word "exclusive" doesn't ever actually mean that it'll only be available at a certain place.  With announcements like Shulk being available at Toys "R" Us or Japanese ROB finally coming over to North America, we can't take the word seriously anymore.  There's no telling this early on as to when the amiibo will be released to the rest of the world but for now, everyone outside of North America will have to import their amiibo, instead of the opposite.