Ok, I have a question. If I used Clefable's (or Clefairy's) Metrenome using Double Edge, against a Chansey, wouldn't I do 160 damage to Chansey? If you read the Chansey card, it says "Chansey does 80 damage to itself", not "this pokémon does 80 damage to itself" If I'm right, please tell me. If I'm wrong, still please tell me. Thanks. :-)

Okay.  This is a FACT of Metronome I am about to post:

When a card refers to itself, such as the above example, when using Metronome, replace that Card's name, and insert the word, "Clefable" or "Clefairy" as the case may be.  This will solve a LOT of problems.