Nacrene City is the second city with a gym, being the last city in the south eastern penninsula in Unova. This city is built upon and reuses many old warehouses and even still has disused track going through it.

Rosewood Furniture
There is a store in Nacrene City where, once you've connected with the Dream World, a girl will make specialised Furniture for you which will be sent next time you sync

Museum
At the top of the city is the museum. This museum is where you need to go to revive various Pokémon and is also where you go to change Deoxys' form

Move Tutor (Black 2 & White 2)
In a house by the Pokémon Centre, you'll be able to teach your Pokémon various moves if you have enough Green Shards.

Name	Type	Cat.	PP	Att.	Acc.	Effect
Tailwind			30	--	--	The user whips up a turbulent whirlwind that ups the Speed of all party Pokémon for four turns.
Gastro Acid			10	--	100	The user hurls up its stomach acids on the target. The fluid eliminates the effect of the target's Ability.
Helping Hand			20	--	--	The user assists an ally by boosting the power of its attack.
After You			15	--	--	The user helps the target and makes it use its move right after the user.
Magic Room			10	--	--	The user creates a bizarre area in which Pokémon's held items lose their effects for five turns.
Wonder Room			10	--	--	The user creates a bizarre area in which Pokémon's Defense and Sp. Def stats are swapped for five turns.
Spite			10	--	100	The user unleashes its grudge on the move last used by the target by cutting 4 PP from it.
Recycle			10	--	--	The user recycles a held item that has been used in battle so it can be used again.
Trick			10	--	100	The user catches the target off guard and swaps its held item with its own.
Stealth Rock			20	--	--	The user lays a trap of levitating stones around the opponent's team. The trap hurts opponents that switch into battle.
Outrage			10	120	100	The user rampages and attacks for two to three turns. It then becomes confused, however.
Endeavor			5	--	100	An attack move that cuts down the target's HP to equal the user's HP.
Sleep Talk			10	--	--	While it is asleep, the user randomly uses one of the moves it knows.
Skill Swap			10	--	--	The user employs its psychic power to exchange Abilities with the target.
Snatch			10	--	--	The user steals the effects of any healing or stat-changing move the opponent attempts to use.

Gym (BW Only)
At the back of the museum is the Pokémon Gym. This gym has you needing to answer various questions by going to a related book on a different bookshelf.