- Lakeba City is a fictional city created by the Pokémon franchise. It is one of the main locations featured in the Pokémon games Pokémon Diamond, Pearl, and Platinum. The city is located in the fictional region of Sinnoh and serves as the eighth and final gym challenge for players. Lakeba City is known for its scenic beauty, with a large lake situated in the center of the city. The gym leader of Lakeba City specializes in Water-type Pokémon.