If you mean toys, you unlock the shop by achieving "genius" level in traits and solving the shady guy int he park's puzzle. This will unlock the shop the next time you see him and can buy toys from him. I suggest the guide posted a few comments back. It's not complete, but might be useful to you.
*Edit: heres the link.
https://docs.google.com/document/d/1P6iYaiVrfa9TLpGbv7B51TocGv3zhcPUK89HzrbKyIw/...