In Pokemon leaf green and Pokemon Fire red it's VERY SIMPLE! All you have to do is go to the Seavault Cannon or go to the hardest place to find them, POKEMON TOWER!
The answer above is correct but it's really not that simple, if you just started and you want a Cubone but can't find one in Lavender Town so decied on the Seavault Canyon your going to have to wait quite a while for it because you have to beat the elite 4 before you can go to the Further Islands such as 4-7.
Get the national dex and talk to Dawn in Sandgem town. Keep talking to her and doing what she suggests. Pretty soon she'd say something about her sister. Talk to the sister and pretty soon she'll tell where cubone is. (Temporarely)
cant you have to find cubone in the safari zone (i forgot where he/she is) but you can evolve cubone into marowak
You have to trade a Cubone from Leaf Green or Fire Red.
you can buy a cubone in the shop when you get enough money in the gambling place
pokeflute
cubone have it
Seven island.
Cubone can be found in the Pokemon Tower (aka Lavender Tower) in Lavender Town. There is a 5%-14% of finding a cubone depending on which floor you are on. 24 is the highest level that you will find them. In the Japanese version of Pokemon blue, cubone can only be obtained through trading.
you go to the marsh area
No, Cubone is not a baby Kangaskhan. A Cubone has no relation to Kangaskhan.
You find in the ghost building.(sorry im not specific.)
route 203 (mass outbreak).
In Johto you can find it in the Safari zone and in Kanto you can find it in Rock tunnel.