lv28
Cubone evolves into Marowack at level 28 in ALL Pokemon games.
cubone>marowak at level 28
Cubone evolves into Marowak at level 28.
Cubone evolves into Marowak at level 28.
cubone evovles once
Cubone evolves into Marowak at level 28.
Cubone evolves at level 28
get cubone to level 28
Cubone evolves into Marowak, starting at level 28.
Cubone evolves at level 28
Marowak cannot be caught in the wild in Pokemon Platinum. You'll need to capture a Cubone, which can be caught in Route 203 when there's a swarm of Cubone. (You'll need to talk to Lucas'/Dawn's sister in Sandgem Town) When it is captured, you can evolve it into a Marowak at level 28.
Giving your Cubone a Rare Bone will not make it evolve. To evolve Cubone into Marowak simply level it to level 28. There is a bone item of note to give Cubone and Marowak called the Thick Club. This hold item will double their Attack stat while held and can be found held by wild Cubone and Marowak.