Accumula Town is a small town renowned for its hills and great views, nestled between Route 1 and Route 2 in south-eastern Unova. It's the second town you'll visit on your adventure in Black and White, and the very first time you'll encounter N, Ghetsis and Team Plasma.
Professor Juniper will explain how to heal your Pokémon and purchase items from the redesigned Pokémon Center, and mentions her friend, Fennel. Ghetsis of Team Plasma, surrounded by townspeople, speaks about liberating Pokémon, and one boy in the crowd seems to be particular interested in the speech. Afterwards, the mysterious boy introduces himself as N and challenges you to a battle.