You cannot find either cubone or marowak in the wild in B2.
The only ways to get them is:
-Trade from a friend
-Use the GTS
-Cubones can be found from icy cave in the dream world but it will have its hidden ability
-Poketransfer from D/P/Pt/HG/SS
-Trade from a B/W game
And I'm sorry to tell you but you also cannot get a thick club in B2. The only way to get one is to get one in B/W and trade it to B2.