Bali Maharajah had a boon from Lord Brahma, that whenever facing an enemy in a combat, Bali will get half of the power of his opponent and he will easily defeat his enemy !
Lord Rama was a Human avatar of Lord Vishnu, and that boon was applicable on Him as well, so to help Sugreeva to regain his kingdom, He killed Bali without facing him.
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Found that answer on Quora. Any other answers?
Quora; i hate that site! lol
Krsna is smarter than the smartest, you can't beat Him, so don't even try. He also tricked Hiranyakasipu, and that demon who got a benediction to crack the head of whoever he touched, chasing a devotee, Amburisa Maharajah. From Bhagavatam.
Funny that, itsacon's Amburisha being the gay Ford illuminati lover of Shitbag Pedo Bhavanada, the grosset demon ever to live. He is like chasing Ford to make his head explode. The difference is that Amburisha in his case is a kali yuga demon Amburisha, a usurper and murderer.