Bus service from Shangrila to Lhasa to Kathmandu

1. No, there is no direct bus from Leshan to Leshan. If you don't mind, take a bus to Panzhihua first and then transfer to another long-distance bus to Leshan. In this way, it takes long (almost 15 hours in total or longer) and not that convenient. Then I recommend you fly to Chengdu first. Then direct buses are available at the airport.
2. I'm afraid direct bus from Shangri-la to Leshan is also unavailable. It is better to fly to Chengdu first.
3. I remember there is a direct long-distance bus from Shangri-la Bus Station to Lhasa leaving at 09:30, but not sure if it still exists.