Let's take a look at these two power houses.
Dragonite Promo- 90 HP
PPower-Special DElivery- draw the card from the top of your deck and replace
it with another card from your hand.
Supersonic Flight-60 damage, flip a coin. if tails, this attack does 0.
Weakness-none
Resistience-fighting-30?
retreat-2 colorless

Fossil Dragonite
100 HP
PPower-Step IN-once a turn you may switch dragonite with your active pokemon
Slam-flip 2 coins, 40 damage times number of heads
Weakness-none
Resistence-fighting-30
retreat cost-1 colorless

Now i personally feel that fossil DRago is alot better than Promo DRago.
Fossil DRago has 10 more hp, makes a huge difference in the game. Retreat
cost -1 for fossil drago. also the ppower of fossil drago lets you switch for
free! Slam in my opinion is alot better than supersonic flight. Slam can do
80 or 40. rarely do o. it has a 33 % chance of doing 0. Supersonic flight has
50% chance of doing 0. also Slam has the potenial to do more damage anyway!
So why don't we all have a fossil DRago in our decks? because he's so hard to
find and any smart trainer who comes across him will defineliety incorperate
him into their deck somehow. Hey he's a colorless pokemon! He can even take
down chary if you play it right. maybe have someone like electabuzz or
chansey deal him some then next time use ppower to switch. fire spin wouldn't
kill chansey in one hit anyway and then have drago finish that crappy fire
breathing excuse of a dragon!