Talk to your (red clad) rival's sister in Sandgem town. She'll tell you that there's a swarm of Pokemon on a certain route. You might not get Cubone at first but eventually there should be a swarm of them on route 203.
after you get the national dex go to route 203 and you may see one . if not talk to dawn's sister and she will tell you all the old pokemons location and she'll say where it is.
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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.
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.
Cubone evolves at level 28
Cubone evolves into Marowak, starting at level 28.
You have to trade a Cubone from Leaf Green or Fire Red.