Multi-turn move mechanics, and stat changes landing on the right Pokémon

[TechLuddite]

From Joseph's feedback after playing the sim: moves that charge or spread their effect over several turns were missing, and stat drops weren't always going to the right Pokémon.

1. Anything that takes more than one turn

All of it curated, modeled and tested — nothing guessed at:

• Charge moves — Solar Beam, Fly, Dig, Dive, Bounce, Phantom Force, Shadow Force, Sky Attack, Skull Bash, Meteor Beam, Electro Shot, Razor Wind, Geomancy and the rest. Semi-invulnerability while hiding, the short list of moves that reach through it (Earthquake finds a digging Pokémon, and hits twice as hard for it), Solar Beam firing instantly in sun and at half power in bad weather, charge-turn stat boosts, and Power Herb to skip the wind-up.
• Recharge moves — Hyper Beam and friends cost the next turn. A miss doesn't.
• Rampage locks — Outrage, Thrash, Petal Dance lock you in for 2–3 turns and leave you confused. A miss ends it early with no confusion.
• Confusion — 1/3 to hit yourself for a 40-power typeless hit off your own Attack into your own Defence.
• Momentum moves — Rollout and Fury Cutter double on each consecutive use.
• Partial trapping — Bind, Fire Spin, Whirlpool, Infestation: 1/8 a turn and no switching out. Mean Look holds with no timer.
• Leech Seed, Wish, Future Sight, Doom Desire, Perish Song, Yawn.
• Taunt, Encore, Disable — three different ways to take a move away.
• Reflect, Light Screen, Aurora Veil, Tailwind, Trick Room.
• Protect — with the escalating failure odds that stop it being unbeatable, and Shadow Force going straight through it. Substitute — soaks damage, blocks status and stat drops.
• Fake Out and First Impression only work the turn you come in; Focus Punch breaks if you're hit first; Roost costs a Flying type its wings for the turn; U-turn and friends hand the turn back so you can swap.

Every counter now ticks in one documented place (endOfTurn), in a fixed order — a Pokémon on 4 HP with a burn and a Wish incoming lives or dies on it.

2. Stat changes on the right Pokémon

Three real bugs, all in the same place:

• The self-vs-target test compared PokéAPI's meta category against "damage+raise", but the baked data spells it "damage-raise". So every self-boosting damaging move was buffing the opponent — Power-Up Punch raised the foe's Attack, and so did Meteor Mash, Metal Claw, Flame Charge, Charge Beam, Ancient Power, Steel Wing, Diamond Storm and Fiery Dance.
• A move's own stat change was skipped when the hit knocked the target out, so a Draco Meteor that KOs left the user at full Sp. Atk. It now drops either way, as it does in game.
• Moves with no meta block at all (Make It Rain, Armor Cannon, Headlong Rush) applied no stat change whatsoever. Fixed.

Verified against the real baked dex: Draco Meteor/Overheat drop the user's Sp. Atk, Close Combat/Armor Cannon drop the user's defences, Power-Up Punch raises the user's Attack, and Snarl/Mystical Fire/Eerie Impulse drop the target's Sp. Atk.

Also corrected

Status moves no longer bounce off type immunities — Encore, Yawn and Perish Song work on a Ghost, Confuse Ray works on a Normal type. That gate is for attacks; only Electric and Poison status moves respect it. And a simultaneous double faint (very reachable now Perish Song exists) names one winner consistently instead of leaving state.winner disagreeing with the event log.

Checks

• npm run test:run — 156 pass, 63 of them new, every expected value derived by hand from the formulas before the code was run.
• npm run build — clean.
• 400 randomised auto-battles against the full 1300-entry dex, teams of 1–6 with real learnsets and a heavy bias toward the new moves: no crashes, no stalls, all decided.

battle.js and typeChart.js are untouched. ROADMAP.md records what's still deliberately not modeled — contact-triggered items and abilities (which is why Spiky Shield and King's Shield block but don't punish), terrain, and the switch-out timing simplification.

🤖 Generated with Claude Code

https://claude.ai/code/session_017SGWh8kJjQsy4QB9pigonf

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Generated by Claude Code