WC/Foreign/Proxy cards at league

[DJGigabyte]

What are the current rules for using either World Championship deck cards, foreign cards (mainly Japanese cards), or proxy cards at league?

Meaning the games played at league to earn the league badges and promo cards.

Are rules different for non-sanctioned tournaments which are being held by the leagues?

 

[bulbasnore]

It is prohibited to use counterfeit cards at league.
World Championship cards are, of course, allowed.
The prohibition on foreign cards is a Tournament rule (not a league rule).

Proxies are not allowed in Tournaments, except where the HJ creates one, e.g. when accidental actions at the table have marked an otherwise legal card. Proxies in the league context? We don't have a ruling on that, other than they can't be counterfeit cards, so it will have to be up to the league leader at present.

 

[PokePop]

And here is the relevant passage from the TPCi document "League_Instructions_TC.pdf" found on the League page of Pokemon.com:

5.1 Pokémon Trading Card Game Play
League seasons can be run using any deck format you choose, though players’ decks must meet standard deck construction rules. It is a good idea to survey your players to determine their interest in formats before deciding. You should choose a format that is interesting to your players. If you have mostly new players, you should run your league using the Modified format, which allows decks to contain only cards from recent Pokémon TCG sets. For more information on different formats, check the Rules & Resources section of your Player Information menu.
The use of counterfeit cards is strictly prohibited when participating in a Pokémon League. Counterfeit cards are never allowed at Play! Pokémon events. If you find a player using counterfeit cards during a league session, that player is not to receive credit for the games he or she plays while using those cards.

Not one word about banning Worlds Championship cards or foreign cards or proxies.
Only counterfeit cards are banned.
Anyone claiming otherwise, or stating that the above ruling is not correct needs to be able to reference the document and section published to support their claim. I think they will see when they try to find it, that they were confusing tournament rules with league rules.