Accumula Town

Professor Juniper leads you into the Pokemon Center and shows you the desk. Bianca meets up with you there. Heal your Pokemon by talking to Nurse Joy. She takes you to the PC, where you can store Pokemon. She then takes you to the Pokemart corner. After explaining you can buy things there, she will leave. Go outside.

The Erotic Sage and His Playmates
Cheren is off to the left where you will find a large crowd. Atop the hill is Ghetsis, the Erotic Sage as he will be known. He is with PETA and suggests that Pokemon are slaves to humans, and suggests liberation. He leaves with his playmates surrounding him. A guy with green hair suggests that your Pokemon is talking. He introduces himself as N, which I will assume is short for Nuisance. Nuisance suggests battling, and then faces you.

VS. N
N has one Pokemon, a Purrloin. Purrloin is fairly useless at this point, so spam STAB attacks (Same Type Attack Bonus attacks). The Purrloin should drop without incident.

Exploration
There's not much to do here. Just go to the house in the northwest and take the Pokeball from the man upstairs. Leave the house and go left from there to enter Route 2.

Go to: Route 2