that's my point. there is no criteria. no one cares. as long as it's on an exchange that's enough.
then again, the coin that is being pumped needs to meet some criteria to be pumped you can't go around pump anything that exists.
for example there should be a minimal activity on that coin before getting pumped, otherwise there would be nobody there to buy the coins from you on top!
and not all rises are pumps. for example yobit is rising prices of some random coins each day but they do it by buying and then selling to themselves. they don't earn anything in the process and only raise the daily traded volume this way. that is why i believe they will go under in the near future.