A little explanation. Pokemon is a series that is now 20 years old where people play a game (often as a portable video game) where the goal is to catch pokemon or pocket monsters. Before Pokemon GO it was already a good way to connect people as you need to trade pokemon to collect them all, you can battke and so much more.
Now there is an app available for Smartphones with Augment reality is a live direct or indirect view of a physical, real-world environment whose elements are augmented (or supplemented) by computer-generated sensory input such as sound, video, graphics or GPS data to play the same game. The app Pokemon Go is one of the most popular apps now. Why do I say it is good for someone with autism, the answer is so many reasons. First of all to find pokemon you have to get up and go places and not stay inside. Next is the aspect that there are so many other people playing the same game. Many gamers who have been playing the game have come across many others playing the game. This is a great way to get your child in social situations and even make friends. Just make sure your child knows who to friend.
You can find out more about pokmeon go on Pokemon's offical website http://www.pokemongo.com/en-us/