If we assume Apple wants to buy a company, it would be SONY. They can make all SONY music content (which is huge) timed-exclusive to Apple Music and the music streaming race is basically over. They can also push exclusive SONY video content (not as huge) to Apple TV.
The App store on all of the iOS devices is attracting enough video games developers as it is, buying Nintendo would not help Apple grow as a service provider as buying SONY would.







