I hate seeing VGChartz being so off in the numbers. They were over 25% off if not further as far as the sales go.
It really makes them lose their credibility, many sites quoted VGCHARTZ numbers when announced.
http://mii-gamer.com/2013/10/15/pokemon-xy-breaks-3ds-records-sells-5-5-million-day-one/
http://www.nizulo.com/2013/10/pokemon-x-y-sells-5-5-million-copies-24-hours/
Zelda informer also had it on their facebook page and an article on their site, but it's been removed already.
Makes me sad :(.