you can't unlock a house
you need to talk to Elizabeth (she must be at the entertainment area for her to sell you the house) and she will say that she owned a house for her pet.. she will say that the house cost her $300000000... then she will say you can have it for $10000 for pet food and the house is your's.. it is a house for pets... and i have a question how do you unlock the mountains?? please answer...
You can go to his gym and just talk to him or in the Survival Area there is a house for challenging Gym Leaders
to fight seifer, you must unlock the area "The World That Never Was", and then go to the fighting area in twilight town, and then talk to the ref. After you kill Hayner a lot of times, the ref will let you fight seifer.
There are two ways to unlock stuff, the first is every 25 fights it will unlock a character and an arena. The second is you fight through single player and every belt fight you win you get a character and the arena they are in. To unlock costumes you have to beat B.F.R. (the last belt fight in single player) with each character to unlock their specific costumes.
One time you will fight jimmy. if you beat jimmy you will unlock him.
unlock him, or in some games fight him
Go to fight area. Talk to a guy near a small house of some sort.
a key
fight in the tournament
buy items it's just like your own house there are certain things you have to do to unlock new items and buy them
The answer to that is the Fight Area. Just like almost any other Pokemon game like Diamond and Pearl.
He is on the survival area, battle him in saturdays and sundays.