Simple pokeball keychain! You can add text to the back if you so desire.

You need a keychain in order to recreate what was in the photo. They can be found on amazon or locally, here is an example vendor: https://www.amazon.com/Swpeet-Including-Keychain-Jewelry-Findings/dp/B07WXFXZ66/ref=sr_1_22?sr=8-22