Hey Aneesha, do you need a self drive vehicle or planning to rent a car with driver? I think from the following car rentals you can choose from: 1. Savaari(Car Rental with Driver)
2. Euttaranchal
3. Zoom Car(Without Driver)
Self driven car culture is less in Uttarakhand, however you can get rented cabs in rishikesh. if you are looking for self driven cars i would recommend you to get it from Delhi only. If you can ride a bike then bike rental is quite easy and cheap in rishikesh.