With the herd gone and the wounded Nidoran asleep, Will is easily able to capture it. The Poke ball strikes it, flashes white energy around it, then falls to the floor where it chimes to indicate a successful capture.

It's a little past lunch time, and your Pokemon look a bit battered after their fights, but also much more confident in their abilities. The walk back to town is quick now you know the way and uneventful.

Back in town you have a number of options:

Your home (if you live here)
Oak's Lab
Poke Mart (Has Poke balls 200y, Potions 300Y, Status Heals 200Y for al types, limited stock of Great balls - 5 in stock at 600Y each, limited stock of PP Ups - 2 in stock at 2000Y each)
Pokemon Centre