be749649_o_Wiki__the_Mario_encyclopedia__Description
[Special] Luiginary Hammer [Effects] Mash the B Button to make Luiginoids jump onto Mario's hammer to form a Luiginary Hammer. Use the Circle Pad to balance the unsteady hammer, otherwise Mario will tumble and the Luiginoids will also fall and disperse. [BP] 10 [Type] Hammer [Location] Dreamy Mount Pajamaja [Description] 
Press the B Button repeatedly to form the Luiginoids into a giant hammer! It will tilt, so use left/right on the Circle Pad to help Mario keep it balanced. As Mario runs, aim with up/down on the Circle Pad and swing with the A Button.
Mario & Luigi: Dream Team - Super Mario Wiki, the Mario encyclopedia