One of the strongest members of the X-Men is Piotr Rasputin, Colossus. The character has long been used as the X-Men's go-to fighter and, in many cases, their secret weapon to unleash during battles. Over the years, he has had some of Marvel's most iconic physical confrontations, squaring off against many of the company's other most powerful fighters.
https://screenrant.com/colossus-vs-marvel-best-fights-ranked-by-power-level/