What this checker knows — and what it does not.

Rules

Standard format for the 2026 season uses regulation marks H, I, and J. The rotation took effect on 2026-04-10 for in-person Play! Pokémon events. Source: official rotation announcement.

Basic Energy is always legal. An older Trainer or Special Energy can be used when the same card has a legal H/I/J reprint by name. Pokémon must carry a legal mark themselves. The MVP does not cover event-specific head-judge exceptions.

Languages

The checker supports English, Japanese, Simplified Chinese, and Traditional Chinese deck compositions. Event language policy is taken from the official rating-zone table and the event level:

• US/Canada and Oceania: English
• Latin America: English, Spanish
• Europe: English, French, German, Italian, Portuguese, Spanish
• International/Worlds: English plus the player’s home-country language; Japanese cards cannot mix with any other language.

Event-specific exceptions are not fully modeled. If the event page says something different, the event page wins.

Data sources

• Event dates, deadlines, venue, fees: RK9 events (public event pages).
• Rules and legal languages: Play! Pokémon TCG Tournament Handbook and Rules & Resources.
• Card names, sets, numbers, regulation marks: Pokémon TCG Data (public dataset, commit 39a26a1).

Last rules check: 2026-10-22T10:30:00+08:00. Event pages show their own last-verified time. If event data is older than 24 hours, or rules data older than 7 days, the result is downgraded to UNKNOWN.

Limits

• Standard only. Expanded, GLC, and Unlimited return UNKNOWN.
• Current MVP snapshot: 5 upcoming majors. More will be added as RK9 announces them.
• No card images, no official logo, no account, no deck upload.
• No guarantee of legality. Always verify with the official event page and head judge.
• ACE SPEC and other special deck restrictions are flagged only when the card metadata identifies them; otherwise verify manually.