So I delivered the town map to the dude and I still cant get to alders house? Am I doing something wrong? Also you have to get to alders house before getting to the first gym right? I'm playing White 2.
After giving your rival the Town Map, you must find the Herdier lost in Floccesy Ranch. You'll only get access to Alder's house once you complete the storyline in the ranch.
Source: Tons of experience with BW2