Alien X, Ben 10 Reboot Wiki

Alien X is the Omnitrix's DNA sample of a Celestialsapien from the Forge of Creation. Alien X is a humanoid alien whose entire body is solid black, excluding his hands, which are white. He has tiny white star-like spots all over his body, giving him the appearance of a starry night sky. He has glowing green eyes with no pupils, and his forehead bears three horn-like protrusions. Alien X wears the Omnitrix symbol on the right side of his chest. Alien X kept Omnitrices he stole from alternate dime

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I made a chart of the weaknesses of the original 10, and according to the wiki, diamondhead is strongest alien, since he has only one VERY UNCOMMON weakness : r/Ben10

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Alien X, Ben 10000 Wiki