Tyson is trained purely to punch, of course he can punch harder than Lesnar.
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The character Allen who is played by Zach Galifianakis
there is machamp, Mankey, and hitmonlee
Ice Punch costs 64 BP at the Battle Frontier in HeartGold and SoulSilver.
Boxing, in its own right can be considered a martial art. In addition, the answer to your question will be different depending on the boxer you choose and the martial artist you choose. For example, a 6 foot 5 inch tall, 300 lb man will be able to punch much harder than a 5 foot tall woman practicing wing chun. Lets assume they are basically twins, because that is what I think you are getting at. You have to remember that there are MANY different types of martial arts, and many different styles of punches. The best demonstration I have seen to answer your question was an episode of a show called Fight Science. Boxing had a heavier punch in that situation: but like I said earlier they were different people. Also, the heaviest punch is sometimes not the best. You can throw light punches to nerve endings in the body and do far more damage (or set yourself up to do more damage) than a very heavy punch that somebody can dodge easily.
Fastest in history? probably Hector Camacho, Ray Leonard, Meldrick Taylor or Muhammad Ali.