The Castelia Gym is designed like a huge beehive. It contains many small hexagonal rooms, several of which are cut off by walls of honey, which are at first barricaded by gates. There are buttons which are placed in the center of most of the rooms, and if certain buttons are stepped on, they trigger the gates to descend. However, a few buttons make Trainers who battle the player appear instead. The player is able to walk through the walls of honey once these gates are gone, allowing them to venture through the Gym and battle Burgh. The Gym is also decorated with pictures painted by Burgh himself. The room in which Burgh stands is slightly different to the previous rooms. The hexagonal room leads to a set of stairs, which leads up to a platform on which Burgh stands.
Pokémon Black 2 and White 2
Initially, Clyde will be blocking the Gym entrance, preventing the player from entering in Burgh's absence. He won't move until Burgh returns to the Gym after the player has helped Hugh to defeat Team Plasma in the Castelia Sewers.
The Gym's interior has been redesigned. The Gym is now made up of multiple levels of silk, and the player must travel through silk cocoons to go between the different levels, battling Harlequins along the way, eventually making their way to the top floor, where Burgh is. The top floor is filled with colored paint on the floor, and Burgh's paintings are hung around the room. After reaching Burgh's room, the player is able to jump down a hole on the left side that leads to the bottom of the Gym.
The Castelia Gym is a lilac building with huge glass windows on the walls and roof and a plant pattern above the front door. It is surrounded by skyscrapers and trees on Castelia City's Gym Street. Leading to the front door are camouflage tiles, while the inside is a botanical garden containing trees from Pinwheel Forest, with a path going through the vegetation to the sand-covered battlefield. Bug Pokémon such as Sewaddle also reside here in the garden. Around the battlefield is more foliage, with two big propagators on its sides.
After making his way through the walls of honey, Black started his battle with Burgh. He was at first unwilling to use Tep due to White not wanting to let it evolve. As such, he resorted to Brav and Tula instead. In the end, Black was left with only Tep against Burgh's Dwebble, which kept striking the Fire Pig Pokémon with super effective Smack Downs. Just when it seemed like Tep had lost, it suddenly evolved into a Pignite, defeating Dwebble and earning Black the Insect Badge.
After the battle, Iris brought an unconscious Bianca to the Gym, realizing that one of her Pokémon had been stolen. Using Pignite's sensitive sense of smell, the group then departed the Gym to find the culprits.
Interior of the Gym
Pokémon used in the Gym
Whirlipede was the first Pokémon that Burgh used to battle Black. It was used to battle against Black's Brav but was easily defeated by an Air Slash.
Dwebble was the second Pokémon that Burgh used to battle Black. It fought against Black's Brav and defeated it with a combination of multiple Smack Downs and the poison status. After Black sent out Tula, Dwebble was replaced with Leavanny, but was sent back into battle after Leavanny and Tula knocked each other out, where it was used to battle Black's Tep. After evolving into a Pignite, Tep defeated Dwebble, giving Black the victory.
Leavanny was the third Pokémon that Burgh used to battle Black. It fought against Black's Tula. Although it managed to pin Tula down with its silk, allowing it to easily knock it out, Leavanny fell afterwards due to being poisoned.