From Bulbapedia, the community-driven Pokémon encyclopedia.
North Petalburg (Japanese: キタトウカシティ North Touka City) is a city located just north of Petalburg City in Hoenn. It appeared in the anime in A Double Dilemma.
The city doesn't appear to be any different than any other at first glance. However, the entire city is obsessed with the Petalburg Gym Leader Norman. In fact, when Ash and his friends were passing through on their way to Petalburg, he was pushed aside for some strange reason when the residents found out he was traveling with Norman's daughter and son.
They were so obsessed with Norman, that when Ash began defeating May in a battle, all of the town started to boo him unfairly, even though he was winning legitimately.
Pokémon seen in North Petalburg