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Known differences from the original game

Only genuine remaining divergences live here: behavior that is still missing, wrong, or approximated for convenience and would need more work for true parity. Faithfully-ported behavior is documented in docs/behavior-porting-notes.md; deliberate additions beyond the original are in docs/new-features.md.

Reimplemented unused Prof. Oak and Rocket Chief battles

The original ROM defines trainer data for PROF_OAK and CHIEF (data/trainers/parties.asm) but never attaches either to an NPC, so both battles are unreachable in the real game. This project makes them fightable after the Hall of Fame:

  • Prof. Oak battles you in Pallet Town once EVENT_BEAT_CHAMPION_RIVAL is set, using ProfOakData's three starter-matched teams (the team is picked by the type that counters your starter, mirroring the rival).
  • The Celadon Game Corner Chief battles you in his house post-game. ChiefData is empty in the ROM, so OPP_CHIEF is given a reconstructed party.

This is an intentional divergence: neither battle can be triggered in the original game.

Reimplemented unused Silph Co. card-key doors

engine/events/card_key.asm and the unused CardKeyTable1/2/3 coordinate lists (data/events/card_key_coords.asm) describe locked doors for Silph Co. floors 2F-11F, but no retail .blk map layout ever places the closed door block at those coordinates, so the card key check is dead code in the original game. This project stamps the closed door block ($54/$5f on floors 2F-10F, $20 on 11F) over each of the 20 door coordinates on map load, and swaps it for the open block once that door's EVENT_SILPH_CO_n_UNLOCKED_DOORn flag is set (using the key from a Team Rocket grunt, as in the original's unused design).

This is an intentional divergence: the doors are not visible or functional in the original game. The door layout lives in tools/rom_manifest.json (field.cardKeyDoors.closedDoors), hand-ported since no retail ROM data encodes it; src/import/RomExtractor.lua copies it straight through on ROM import.