From Bulbapedia, the community-driven Pokémon encyclopedia.
Eterna City (Japanese: ハクタイシティ Hakutai City) is a city in the region of Sinnoh. An old city that shows fading vestiges of ancient history. The Bicycle Shop, Rad Rickshaw's Cycle Shop, is here. It is an extremely old city will tall buildings and the Herb Shop. Team Galactic constructed a sinister base here, creating a dark and sinister atmosphere in the city. The Underground Man's House is also here, where the Explorer Kit can be obtained.
There is a rather large statue of Dialga or Palkia (depending on the version played) in the east side of town that was once the main center of festivals in the town, although the town's culture has started to slip away. Both Team Galactic and Cynthia become interested in the statue. After the National Dex has been obtained, Professor Oak appears in the southernmost house in the city.
The Eterna Condominiums are the home to Sinnoh's Name Rater. Another person in the building will trade a Chatot for a Buizel, and yet another will give away TM67 (Recycle).
Gym Leader's pokemon