you find the boss IN SPEAR PILLAR that is where you get dialga in the dimond and palkia in the pearl THE BOSS iS NAMED CYRUS
You can find one of Team Galactic's buildings in Eterna City (the one at the very top).
When you beat the final boss of the game, you get a list of all the shadow Pokemon and where you can find them.
go north of etrena city, cut down trees. there's team glactic's building. take the path ot the east u should find thief hidden somewhere there.
In pikachu's snatch
The doors have the pokemon on the door behind it (i think. it may be a different pokemon). To open them, do a wireless mission, and beat the boss. if you find a door with the boss on it, walk up to it and it will crumble. claim the pokemon inside. hope i helped
There are NO Weepenbell bosses.
He's not blocking the way. The boss is in Spear Pillar at the top of Mt. Cornet.
There isn't too much information where you can find out how to act like a boss. The only place where you can find out how to act like a boss would be to visit a local college and take a class.
galactic eterna building, where u fight the boss
You look for a boss bounce pad thats sparkling.
Bulbapedia.bulbagarden.net is the best place to find everything about Pokemon.
After beating Boss Gallade you find a wild Gallade at The Oil Field Hideout