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It is possible with almost any manual transmission to upshift and downshift without using the clutch. It is a matter of matching the transmission input shaft speed to the output shaft speed. Typically when upshifting on a bike, you put a little bit of pressure on the shift lever with your foot, snap the throttle off and back on quickly. In the brief moment that the shafts are unloaded, the sliding parts are free to move. The same thing applies to downshifting, but you apply a little bit of throttle instead of chopping it.
Unless you are really good at it, it will damage parts. And while you are learning to do it, you will damage parts. Besides the long term damage that will eventually make the transmission difficult to shift and "jump out of gear" under load, the short term damage is the hardened little bits of metal that get knocked off the engagement "dogs", as they are called. Although they will get stopped by the oil filter if they make it that far, they do have to go through the oil pump first. Transmission parts are hardened, as in brittle, so when pieces break off they are not smooth and round. They are pointy with sharp edges. And there is also the possibility that they will get in between the mating faces of the gears.
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