Just leaving the Safari Zone, the group comes across a bridge which could be used as a shortcut to Sunny Town. They discover that the bridge is too long to walk and they would need bicycles to cross. They go to the Pokémon Center where Nurse Joy asks them to take some medicine to a sick Pokémon across the bridge. They borrow bicycles from the center and are off. Halfway, they come across a bike gang. They battle the gang and before long Jessie and James show up. They are welcomed as this is where they used to live and were well known by the gang members. They are all quickly chased off by the police and Ash and the group continue to deliver the medicine. They come to a raised part of the bridge as a boat is going by and they desperately make the jump. They use Team Rocket who on the other side were trying to show off as good riders and bounce off of them to make it across. They are blocked by the gang, but tell them they are getting medicine to a sick Pokémon. They gang helps them to the center and the Pokémon gets the medicine just in time. (thetvdb.com)