No. The knuckleball is a perfectly legal pitch.
The only pitches that are illegal are any pitch that utilizes a ball that is altered in any way (including foreign substances, like vaseline, spit, pine tar, etc.)
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The first prominent pitcher to throw the knuckleball was Ed Cicotte of the Chicago White Sox. Click on the 'Knuckleballers' link on this page to see some of the best pitchers who threw the knuckleball.
No Well...actually he threw a knuckleball once.......when he beaned Ventura in 1993, he hit him Robin several times with his knuckleball.
In baseball, corked bats are bats with something like cork on the inside. They have been illegal in the MLB since 1970.
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I don't know exactly but I've watched the Little League World Series enough and they always refer to Little Leaguers pitching speed in relation to MLB and I believe that 70 mph Little League would be around 100 mph MLB A 70 mph little league pitch is equivalent to about a 111 mph MLB pitch. (This is calculated based on an average little league pitch at 57.5 mph and an average MLB pitch at 91 mph.)