Pokemon Battle Theater ROM

Features

• 120 trainers across Kanto, Johto, Hoenn, Sinnoh, Unova, Kalos, Alola, Galar, Hisui + PWT + anime World Champion Ash
• 9 Legends Arceus trainers — Volo, Adaman, Irida, Ingo, Akari, Kamado, Zisu, Beni, Rei
• Tournament mode, 8 trainer single-elim brackets per region
• Best of N match format with adaptive picks between rounds
• VGC mode, forced doubles, Lv 50 cap, 4 pick of 6
• Team preview AI, scores each mon against the opponent’s whole roster and picks the optimal lineup (one of the coolest additions)
• Custom Trainer slots, full PKHeX style editor in-ROM (sprite / name / species / item / ability / EVs / IVs / moves / nature / gender / shiny) saved to your file
• Pilot Mode, control the player AI’s loaner team yourself
• Level cap (off / 50 / 75 / 100) for fair matchups
• Z-Moves / Mega / Dynamax / Gigantamax, AI bias tuned to fire signature attacks eagerly
• Custom Battle Theater background by LiYun
• Affection + Terastallization disabled for cleaner sim

Known Bugs

• Player trainer name sometimes renders with glitched / corrupted characters in battle dialogue.
• Trainer picker menu occasionally shows funky text on certain entries when scrolling. Closing and reopening the picker normalises it.

Changelog

V2.0.3

• Z-A trainers were Terastallizing in sim battles — they’re supposed to Mega Evolve only. The opponent-side Frontier fallback in ShouldTrainerBattlerUseGimmick was reading MON_DATA_TERA_TYPE > 0, which always returns TRUE because the accessor defaults to the personality-derived primary type. Sim opponents now go through opponentMonCanTera exclusively (set only when the party file explicitly declares a Tera Type), so Z-A trainers, past-gen trainers, and anyone else without an explicit Tera Type stay locked out.
• Pilot mode SV trainers showed no Tera button — the engine’s player-side orb check tested FlagGet(B_FLAG_TERA_ORB_CHARGED), but our config sets that flag ID to 0, and FlagGet(0) is always FALSE. So the orb was treated as permanently uncharged and Tera was hard-blocked for the player. Pilot mode now bypasses the orb mechanic (loaner team, not your collection) AND the orb check is defensively guarded on the config flag actually being set, so Tera shows up whenever you pilot Nemona/Geeta/Hassel/etc.

V2.0.2

• Tournament with a partner set was silently dropping the partner and running as 1v1 singles instead of the intended 2v2 with rolled opponent partner. Root cause: the v2.0.1 partner-in-tournament check required both the Double Battle toggle AND a partner to be set — but the picker auto-displays “Doubles: TRUE” whenever a partner is set without actually flipping the underlying toggle, so users were stuck in a state where the UI said doubles but the engine got singles.
• Now: setting a partner in the picker is sufficient. Pick your partner, pick a tournament cup, hit Try Battle → every round has your partner with you, and the opponent gets a fresh partner rolled from the cup each round.

V2.0.1

• v2.0 shipped with Tera still broken. battle_terastal.c::CanTerastallize had a stale return FALSE; from v0.41.1 (the original project-wide Tera disable) that I missed when wiring up the new gate. Sim_TrainerCanTera was working in v2.0 but the engine bailed before it ever got consulted. Removed the stale return — Tera now actually triggers for Gen 9 trainers, custom slots with Tera Type set, and the 45 random Frontier mons that got Tera Types in v2.0.
• Tournament tag-team partners. Set up a tournament + flip Doubles on + pick a Co-op Partner in the trainer picker → your partner joins you every round of the tournament. The opponent gets their own partner rolled each round from the cup trainers not already in the bracket (so every match has 4 distinct trainers). If the cup is too small to spare an extra trainer, the match becomes 2v1 instead.

Useful Links

Reddit

Github