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They're high levels because Metang was caught from the wild (Giant Chasm, Bulbapedia confirms it), and the Munchlax was traded within the game.
I have the Black version. However I'm having trouble breeding them to a lower level, so you are probably better off asking Ezio-X to help you.
Thanks for helping me out. :D I wasn't sure how to repay you (hence why I gave you the nugget.)
If you decide to get a Black/White version I have tons of pokemon and good items (eg. masterballs) to give away, as I have finished the game and don't need them.