Most cats use a litter box, but a litter box means constant cleaning. That’s why owners in Australia trained their cat, Cadbury, not only to use a toilet, but to put some toilet paper in the water and flush it afterwards.
Cadbury apparently learned to use the toilet from a training device that teaches cats to get used to balancing on a toilet without falling in. This training device appears to have worked for Cadbury so maybe it can work for your cat too.
To learn more about the cat that can use and flush a toilet, click here.