Doge has been one to of the best to short when it happen to pump.
You can short any top coins. ETH is the best one.
Agree on this one, ETH has dropped a lot and this is one of the best as well as of the moment. You can also buy it if you are going to go for long term instead of shorting it.
Bitcoin Diamond and Bitcoin Dark pumped as well but I'm not interested with those forks.
short altcoin in my opinion, x, achain, crypterium,
is perfect for you if you want short trade and short investment