I’m very tempted to ask you several questions, Rotom, but my editor is currently glaring at me via video chat, so I gather that would be a terrible idea.
That having been said, have your trainer purchase a film-based camera. Mini cameras are currently making a comeback, so if you enjoy the feel of something new, that may be an option. Alternatively, older models sell for rather cheap on PokéBay. Ensure that the camera lacks a roll of film, transfer into it, and click away.
Alternatively, if you wish to surprise your trainer, rather than ask for a camera, consider transferring into something else around the house that can move or click, such as a fan, a washer, a remote computer mouse, or any of the like. Use the movement of these objects to relieve your urge to manipulate a camera shutter until you feel comfortable inhabiting a camera without needing to take pictures. The transference of movement should help you by way of being an outlet so that you shift your needs from taking a picture to simply releasing your pent-up energy.
Good luck, little rotom!