There isn't one. Regular Show is basically about two grown men disobeying their boss and almost getting fired every episode. There is no possible moral lesson from this.
Moral lesson in karaniwang tao
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The moral lesson of the story is be selfish
They sometimes give you the moral or lesson learned in the show like Captain Planet
For the money
what is the moral lesson of what
The moral lesson of it is not to be envy..
Moral lesson in karaniwang tao
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Elephant and Friends moral lesson
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moral lesson in mill on the floss
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What is the moral lesson of the story of rice