It depends on what generation of games you are playing, but in the 4th Generation it learns Triple kick at level 19.
If you need more info you should check out a site called bulbapedia.bulbagarden.net
Here you can find all the moves a Pokemon learns at at what level, in games from Red and Blue to Black and White.
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Hitmontop.
Level 12
Meditite learns Hi Jump Kick at level 32.
Level 12
Mankey learns low kick at level 9. it's a great way to beat brock.