The Pocketsize versions are very hard to find. To find a PS Punch Out is almost impossible. But those versions do exist! This auction shows once again, that it would be smart to determine the value of the itmes which are for sale. Buy it now price for this extremely rare item was a super low USD 29,99 ...! Auction 280239019551, or as PDF file (210 KB).
Many information about ths PS games can be found in the Pocketsize FAQ.