From Bulbapedia, the community-driven Pokémon encyclopedia.
The Galactic Eterna Building (Japanese: ギンガハクタイビル Galactic Hakutai Building) is a building in Eterna City where Team Galactic perform operations. When Team Galactic steal Pokémon from trainers in Eterna City, the player enters and defeats some Galactic Grunts and Scientists, plus the commander Jupiter. The HM move Cut is needed to access the Galactic Eterna Building.
In Pokémon Platinum, this is where Rotom can switch between its different forms. With the help of the Secret Key, a room opens up which contains five appliances that change Rotom's current form into the form of the player's choice. When Rotom is transformed for the first time, Professor Rowan will come in and say:
"Ah, imagine finding you here!. You must be eager to fill your Pokédex to be searching even here. What am I doing? I visit a professor I know in Eterna every so often. He tells me intriguing rumors of rare Pokémon sightings and such.
A Pokémon that slips into electric appliances, you say... Hmm... That is somewhat off from what I've heard about it. Hmm... This is what I've heard. Long ago, there was a Pokémon that merged with a toy robot. Should that Pokémon be recognized as a new species or not... Debates over the issue were about to start when they were rendered moot. The very topic of discussion--the Pokémon-infused robot-- disappeared...
Anyway, this ROTOM... What an interesting Pokémon. So, you say it enters an appliance and essentially merges with the device. In the process, it may also learn new moves. In a way, I suppose it could be thought of as a mechanical Pokémon. Hmm...! Though it is utterly unique, it is undeniably a form of Pokémon. Fine, fine, so be it! No matter how old one gets, there will always be new Pokémon discoveries! Take care, <player name>!"
Also, there is a notebook on the table containing notes on Rotom, written by "the scientific genius Char..."
The Galactic Eterna Building has four stories. Each story contains members of Team Galactic.
Items
Trainers
First floor
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Second floor
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Third floor
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Fourth floor
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First Floor
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Second floor
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Third floor
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Fourth floor
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Team Galactic 
