Planche seems to be something unattainable (and for most it will) but it is not the top. There’s still plenty of much harder variations. Here’s the list of top 10 planche variations with examples.
Planche on vertical bars
Changing the bar from horizontal to vertical can be quite a challenge
Close grip planche
Similarly to the push ups, the level of difficulty changes significantly with closer grip
Planche on fingers
Maltese is basically a planche with arms placed wider, which makes the angle between your chest and arms bigger, therefore making it harder than a regular planche.
Planche is strength skill, but in this variation balanse is also involved.
Harder version of dragon planche
Planche on 4 fingers
Planche on thumbs
one arm planche
One arm planche requires you to shift the weight over to one of the sides by bending your body