Hello,
There is no shuttle bus from Longquan to Emeishan. You can transfer to Leshan.
Departure time from Longquan Sunshine City Bus Station and Leshan Xiaoba Tourist Station: 9:20 14:30 (two flights a day) Fare: 53 yuan
Leshan Xiaoba Tourist Station Emeishan Departure time: 7:10~18:00 (running class) Fare: 8 yuan
I hope it will be helpful to you and hope you will adopt it.