How can I delete a photo in one device without deleting it in other devices?
How can I delete a photo in one device without deleting it in other devices?
iPhone 12 Pro
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You can't if you have iCloud Photos turned on in both devices.
iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: Set up and use iCloud Photos - Apple Support
Apple does not currently offer cloud-only storage for photos. If that is what you want or need, you may want to explore 3rd party options such as Google Photos or Dropbox.
If you want to turn off iCloud Photos on a device, see the information in: Get help with iCloud Photos - Apple Support