To the majority of Machamp, dodging or blocking an attack is the height of cowardice. All Machamp are champions, if only in their own heads, and a champion will endure whatever attacks are thrown at it, to the point of running into an attack if it appears likely to miss. These Machamp expect the same honor from their opponents, and have developed normally wild attacks like Dynamic Punch with pinpoint accuracy, at the expense of possessing any skill in dodging.
Centuries ago, a hated Johto Emperor was overthrown, and the revolutionaries put him and his pokemon to a Pinsir's guilliotine. They fled in every direction; the emperor was caught and executed, but some of his smaller pokemon escaped into the crowd. His Machamp would do no such thing. Faced with a hopeless struggle, he punched the Pinsir in the face before his execution, so he could say he went down fighting, then stood unflinching as the Pinsir's giant, spiked horns ripped his head from his body.
There is a minority of Machamp which do not believe evasive measures are cowardly and will dodge any attack they can. Surprisingly, these Machamp are not weaklings attempting to win at any cost, but equally ferocious fighters who follow a different code of battle. They are known far and wide for their guts.