Before I get into a long schpeal about this, has the TCG Community at large ever determined what cards in the game counted as the "Power Nine", that is, nine cards of such unprecedented power that they will never be reprinted again?
Nope =P
9 cards that are so broken that they will never be reprinted? In no specific order:
1) Professor Oak
Professor Juniper is not a reprint. Since the introduction of Supporters, normal Trainers are no longer 'draw' cards, providing at most a single card draw without flips. A draw Trainer, let alone one that draws 7, will never be reprinted. This should be undisputed.
2) Super Energy Removal
They haven't even been able to reprint Energy Removal without adding a flip clause. Thus, there is no chance of this ever being reprinted.
3) Slowking NG
I obviously mean the Wizards version, and not the original Japanese one. A Pokemon that practically stops all T/S/S for the opponent is far too broken. Dark Vileplume/Vileplume UD were in effect for both players, and Gothielle will only work while active. Given that Vileplume/Gothielle don't even block T/S/S, and given Slowking's infamy of being one of the only two cards ever banned, there's no way it'll ever get reprinted.
4) Uxie
Far too strong a draw card.
5) Crobat G
I don't think PCL realized how strong placing a damage counter without attacking is when they made this. Before anyone says Kingdra, I'd like to remind everyone that it's a Stage 2. Although it's only truly broken when paired with Scoop Up/SSU/PokeTurn, a Basic being able to place a damage counter
anywhere won't be printed after the whole Uxie donk/Sableye debacles.
6) Item Finder
Before anyone starts, Junk Arm is not a reprint of Item Finder, as Item Finder gets T/S/S, and Junk Arm doesn't.
I don't see 1-6 ever being reprinted. 7-9? COULD happen, but very unlikely, like Porii Sames winning a Worlds. Or Chuck NOT winning Worlds.
7) Computer Search
Again, a Trainer doing flipless draw/search is highly unlikely to be printed since the introduction of Professor Elm/Supporters. You have to wonder whether discarding 2 cards is a similar effect to flipping a coin? Given that I'd be more inclined to play CS than Victory Medal in ANY format, I'll have to say no, but I could actually see CS being reprinted in the future.
8) Lass
As a Supporter? Possibly. As a Trainer? VERY unlikely.
9) The Rocket's Trap
This card is almost as bad as Gengar SF in terms of being 'annoying' (The most annoying cards in Pokemon, future MonsterOfTheLake's Lake article? PERHAPS!). Both involve flipping a coin to do something REALLY annoying to your opponent. Given the most recent disruption card we got, Cyrus' Initiative, being a Supporter that can grab 2 cards max, a Trainer that can possibly grab 3 cards on a SINGLE flip is NOT going to be reprinted. It's definitely the weakest of the 9, but as likely as any to not be reprinted.
Honorary mentions
Rocket's Sneak Attack
Aside from having the hottest card art (including Misty's Tears), this card practically guaranteed ruining your opponent's hand if you played it the first turn. Cards like Cleffa NG, Sableye SF, Chatot MD and Cleffa HS/CL can help you recover from it, so it's not as disgustingly powerful as it used to be, but still extremely unlikely to be reprinted.
Gust of Wind
A stupidly broken card, which only misses the Power Nine by virtue of actually being reprinted. What the hell, PCL?
Pidgeot RG
Any card you want, with no side effects, EVERY SINGLE TURN. Very unlikely to be reprinted, but it could happen.
Energy Removal
Almost as broken as SER, and has only been reprinted with a coin flip so far. Given that GoW was reprinted, it's a possibility that our old friend ER will actually get to play in a Modified format for the first time.
Scoop Up
Like ER, this has only been reprinted with a coin flip clause. It's not strong enough to be reprinted as a Supporter (given Seeker and Mr. Briney), but too strong to be reprinted as a Trainer.
Chaos Gym
Not as broken as the other cards, but as likely as any to not be reprinted. Gambler has a better chance of being reprinted than this psychotic card. KADABRA has a better cha... ok maybe not.
Erika
It's a Trainer that draws 3. Sure, your opponent draws as well, but it's still too strong a draw source for a regular Trainer, and won't be reprinted.
Bill
Too much draw for a Trainer.
Imposter (sic) Oak's Revenge
Too disruptive for a regular Trainer.
Focus Band/Baby Rule
Neither will be reprinted.
Double Full Heal
Wait, what?