The Greatest Robot on Earth, Astro Boy Wiki

The Greatest Robot on Earth ("Chikyū saidai no robotto" 地上最大のロボット) is a chapter of the Astro Boy manga which originally ran in Shonen magazine in March 1964. A sultan called Chochi Chochi Ababa the Third has a built a robot named Pluto to be the king of all robots. He sends him to fight seven other powerful robots to prove that they are indeed the greatest on Earth. His first stop is Switzerland, where a robot named Montblanc is chopping down trees. He gets caught off guard as Pluto successfully

Pluto: Urasawa x Tezuka, Vol. 8 (8) by Nagasaki, Takashi

Pluto: Urasawa x Tezuka, Vol. 4 (4) by Nagasaki, Takashi

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The Greatest Robot on Earth, Astro Boy Wiki