Level 20 is when it learns Spark, and then he starts to learn all sorts of other moves like Discharge.
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No Pokemon can learn more than four moves.
You can find all the Pokemon and their stats here: <A href="http://www.gamefaqs.com/portable/gbadvance/file/929408/40397">http://www.gamefaqs.com/portable/gbadvance/file/929408/40397</A> Search in Ctrl F for cubone. It will tell you a lot about him including the moves he learns at certain levels and the ones he can learn with TMs and a bunch more information. .
some Pokemon do learn some don't
Pokemon will not learn moves while being raised in the daycare center. They will keep the same set of moves that you put them into the daycare with. However, moves that were missed can still be relearned through the move tutor.
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