Ohhhh, lol, ok. A corporation mark specific dates to make big amounts of incomes, thats why, for example, the same day Super Mario Maker launches, a lot of amiibos does it too. The same can be said for the launch of Animal Crossing Happy Home Designer, where also in the same day a lot of amiibo release. As i already told you, corporations, Nintendo in this case, mark several key day along the year where they intend to produce a lot of money. And thats why Star Fox and Mario Tennis launch on the same day. Two completely different games that catter to different type of consumer, so that speciffic day a lot of people buy a Nintendo product. Also, a person who goes to the store to buy star fox for example, can be seduced by mario tennis and buy the two games.