Everything game relevant has to be the same
unless there is an erratum for older versions of that cards, making the older versions play the same as the current versions.
In the case of Dark Charizard, at least if I understand it all correctly, here is what all would have to read the same:
Dark Charizard — 80 HP — [R]
Stage 2 — Evolves from Dark Charmeleon
[C] Nail Flick: 10
[R][R] Continuous Fireball: 50×
Flip a number of coins equal to the number of [R] Energy cards attached to Dark Charizard. This attack does 50 damage times the number of heads. Discard a number of [R] Energy cards attached to Dark Charizard equal to the number of heads.
weakness: [W]×2
resistance: [F]-30
retreat: 3
The
only wiggle room is where text can mean the same thing but have a slightly different wording. Card name, HP, Stage, Energy Costs, etc. all have to be the same. A tournament legal Dark Charizard reprint is
not happening because of the Resistance. Resistance changed from -30 to -20 over the years and taking even less damage from [F] Type attackers is indeed a significant change.
The good news is that I remembered a thread that explains this. PokéGym is a semi-official Pokémon website; while not directly owned by Nintendo/TPCi, it is owned and operated in part by individuals who make up the North American Rules Team. It actually has a section where you can ask questions to receive official rulings, plus a large list of already established rulings. It
also has
this thread, which lists what older cards are still legal and explain the process better than I do. ^^'
I don't know who ZapdosTCG is; are we talking a Youtuber or another board member? At least part of this sounds like a miscommunication, whether because you're didn't quite catch what he said
or because he doesn't know what he's talking about. XD I'm not trying to be mean, as I've often been guilty of
both over the years. ^^'
I'll take a stab at "proxy prints"; that just sounds like he printed off some proxies, instead of scrawling them out by hand. Forgive me if it was only the "print" part making it confusing, but just in case I'll explain what a proxy is. It is a stand-in for an actual card. They're
completely illegal in tournament play
except when a judge uses one to replace a card that was damaged to the point of being considered "marked" during an event (the proxy is no longer legal after the tournament is over). A proxy can be as simple as taking a basic Energy card and writing the name of the card for which it is a stand-in on the face of it. Proxies are used to practice, and not tournament legal beyond the exception listed.
A Pre-Release Deck is normally what you'd call the deck you built at a Pre-Release. Possibly, he's just making things confusing by using that term to refer to a deck built containing proxies of cards that haven't officially released yet. Some cards are revealed - even in English - before their official release. We usually know what is supposed to be in a set shortly before Pre-Release tournaments begin. Meaning a set list, not full scans of that set.