http://www.neogaf.com/forum/showpost.php?p=210670839&postcount=281

Level-5 sent PR for YW sales. 

- Series: 10 million units (July 11th 2013 to July 17th 2016). Includes all 7 games on Wii U / 3DS, but only physical (no digital).
- Best-selling entry is Yo-kai Watch 2 (original versions) with 3,178,000 units sold.
- Yo-kai Watch 3: 581 000 units (2 days)

FW sales for previous Yo-kai Watch games (Famitsu via Game Data Library):

Yo-kai Watch (2013): 52 901
Yo-kai Watch 2: Ganso / Honke (2014): 1 281 096
Yo-kai Watch 2: Shin Uchi (2014): 1 211 918
Yo-kai Watch Busters (2015): 688 386
Yo-kai Sangokushi (2016): 263 637
Yo-kai Watch 3: 581,000

As I said previously, the milking is already shown by the decreasing FW numbers, Level 5 will have yet again another dead IP in a matter of a few years...

Meanwile Pokémon stays strong, Yo-kai should beware the Bewear

It might have beaten YWB if its a full week...... But not sure if YWB FW sales were a full week.

Milked the cow completely dry.
Shame. If they had paced it and allowed time considerable time between releases instead of milking it like they did, those Pokemon level sales could've lasted.

wow what a drop, I think it is safe to say that the yokai watch craze was just temporarily.

YWB came out on July 11th which was a Saturday as well last year. 

Holy crap this drop is really insane... It's below Youkai Watch Busters (spin-off) and not even half of the first week of Youkai Watch 2.

Disappointing numbers

Good to know. Not only is this game getting milked to death, but it's not a good game to begin with. It doesn't deserve its success at all.

Go back to making good games, Level-5.

I guess this is what happens when in 6 months you release 3 Youkai Watch games. Still if the legs manage to bring it at 1million it will be a good result. Not great but good.