>>57334745>3 stage evoIf your 3 stage is sitting in the back until comes online it's not so bad, plus you have Poke Comm.
>3 energy costLike you mentioned it's free energy. It's easy to overlook but that is the most powerful ability in the game: Serperior, Gardevoir, Misty, etc.
>to do only 110 damageThink of it like 110 plus whatever damage Darkrai has already done which can easily be 60. That's not even counting Darkrai attacking.
>energy discard seems incredibly mediocreThat is what everyone thought be we forget that 1 energy at the end of the game is nearly meaningless when you are getting a KO, think of Ninetales or Yanmega, if it's helping you win you will just keep winning.
Also they have good synergy against the meta, they can handle all the psychic and water decks, not to mention all the birds.