Magic!
By the chimney if they have one
He doesn't!
You go out of the tunnel you got in through. Go near it and it will say to press a to enter. push the joystick up to crawl.
Once you defeat the elite 4 in emerald, go to Fallarbor town, go to the left edge of the town where you will find a house named fossil maniac's house,enter the house where you will find a small tunnel, enter the tunnel, on going further there will be an exit of the tunnel, after exiting you will find yourself in the desert under pass.
As legends and myths hav it, he slips down through the chimney. But if you think about it, it is rather impossible now a days. Have you never seen a Christmas movie in your life?
He can enter any home,even if there is not a chimney.That is one of his special skills.
you talk to a guy near the rest house before the rusturf tunnel entrance.
If by enter in house you mean breach the security system, through the internet, then, that would depend on if the system is connected to the internet, if it is, then probably.
He goes either through a chimney or a widow or through the door.
You have to get through rock tunnel, by going east of cerulean city, through the robbed civilians' house and slashing through the thin tree. Then, you have to fight several trainers, then through the tunnel, and wala! You're down to Lavender Town.
they are in fallarbor town. go to the house in the northwest part of fallarbor and go through the tunnel