On your web-site you said that  If you put a Ditto with 10+ damage out
against a Mysterious Fossil or Clefiary Doll that your opponent would NOT
take a prize because it is a Mysterious Fossil/ Clefairy Doll.  I talked to
Wizards on this one and they said that Ditto always reverts back to Ditto
before being knocked out, and is THEN knocked out, so then you wouldn't
actually get to draw a prize.

If Ditto reverted back to Ditto before being knocked out, then it would have 50HP and not be knocked out.  Sorry - flawed logic there. =)

Another question is about Ditto VS Energy/ Energy cards.  You said that if a
Ditto was copying a Venusaur the only energy it could move were actual GRASS
ENERGY CARDS, but Wizards says Ditto can use any energy as any energy, and
that Ditto can use any energy when using a Moltres' Wildfire.  Can Ditto move
any energy if copying a Venusaur?  Can Ditto discard any energy when doing
Wildfire?  I partially disagree with Wizards on these questions.  Help me
out, Scottie!

There is actually a fair bit of debate over this subject.  Here is my take on it, which I am pretty sure is right:

Energy on Ditto can be any type of Energy.  This is why you can discard for Wildfire.  So, if it can be any energy type, then there is no reason that it can not be a grass Energy to transfer from Ditto.  Once it leaves Ditto, it is not grass anymore, but it counts as grass at the time, so it can be moved off Ditto.

Scott