If you are talking about the Old Chateu, it is at the end of the Eterna Forest (beginning, if you come from Eterna City). It is a home to Gastly and Haunter, and there are a few Items on the inside and around it. If you are talking about the Pokemon Mansion (Mr. Backlot's Trophy Garden), it is located south of Hearthome City, Route 212. The garden holds a lot of cute Pokemon, such as Buneary and sometimes but rarely Evee. Back in Mr. Backlot's room, there is a book sitting on his desk that has a picture of Manaphy in it. Look at it, and Manaphy's spot registers in your Pokedex.
They are rotom forms they are in the old mansion.
you have to check the tv from 6 - 8 pm
on platinum, you see Manaphy in Mr.backlots Pokemon mansion
its 1 of the daily Pokemon in the Pokemon mansion
you can find a wild kirlia in the Pokemon mansion area but not in the Pokemon mansion
It is in route 212.
in the mansion that has gastly
in Pokemon mansion in route 212
go to the Pokemon mansion and then trade for manaphy
you have to go down from hearthome city
go south of hearthome
There is no Pokemon mansion in emerald. only in Pokemon red yellow diamond pearl and platinum. The first apperance on the Pokemon mansion was in Pokemon red which was the first Pokemon game in 1995. thank you