[wrren]

It's a pretty sensical and predictable movement though; Nintendo's first real foray into smartphone games becomes the most successful launch ever, leading the stock market to rationally believe that Nintendo will begin to really push their IP into this space and make lots of money. The irrational party is Nintendo, since they now give every indication that the success of Pokemon Go will have no effect on their strategy; the stock market has now responded and said 'we don't think Nintendo will make as much money in future as we'd previously predicted'.

[ocdtrekkie]

In fact, you're making the same mistake investors did: Believing Nintendo made a foray into smartphone games. Nintendo did not make Pokémon Go, nor is it receiving much profit from it. Niantic, Google, and Apple are all getting the lion's share of the profit, Pokémon Company gets a bit of it too, but then Nintendo only gets a fraction of that.

[wrren]

I may be incorrect, but Pokemon Go was released with Nintendo's approval; meaning they've dipped a toe into smartphone games.