You can get it by talking to Dawn/ Lucas's sister in Pearl or Diamond. Each day they tell you a different species of Pokemon is swarming, and where to find it. The Pokemon changes each day, so Cubone will eventually be swarming, if it isn't today.
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Yes, Cubone does evolve. You can get it at Route 203 in Pokemon Pearl or Diamond. It only appears to be here if it is swarming in the area. It evolves at 28.
Cubone evolves into Marowak, starting at level 28.
Cubone evolves at level 28
Cubone evolves at level 28
You have to trade a Cubone from Leaf Green or Fire Red.