No flightschools as such there. None pretty much. Only commercial operation, no General Aviation.
The Avia club in pokhara started a training thing but i am not sure if it still on. That is just powered handgliders.
But id avoid training there. Especially for a foreigner, the process doesn't even exist. But at Avia club you can fly pay extra and do few landings on sports aircraft. But that part of nepal isn't high elevation, but beautiful scenery.