Pokémon Emerald (pret/pokeemerald)

Emerald's type chart, gTypeEffectiveness, is a flat u8 array of 108 non-neutral (attacker, defender, multiplier) rows over 17 types, then a TYPE_FORESIGHT marker, two Ghost immunities, and TYPE_ENDTABLE. pokeemerald/type-chart

Value

{
 "kind": "type-chart",
 "types": [
  "Normal",
  "Fighting",
  "Flying",
  "Poison",
  "Ground",
  "Rock",
  "Bug",
  "Ghost",
  "Steel",
  "Fire",
  "Water",
  "Grass",
  "Electric",
  "Psychic",
  "Ice",
  "Dragon",
  "Dark"
 ],
 "matchups": [
  [
   "Normal",
   "Rock",
   5,
   337
  ],
  [
   "Normal",
   "Steel",
   5,
   338
  ],
  [
   "Fire",
   "Fire",
   5,
   339
  ],
  [
   "Fire",
   "Water",
   5,
   340
  ],
  [
   "Fire",
   "Grass",
   20,
   341
  ],
  [
   "Fire",
   "Ice",
   20,
   342
  ],
  [
   "Fire",
   "Bug",
   20,
   343
  ],
  [
   "Fire",
   "Rock",
   5,
   344
  ],
  [
   "Fire",
   "Dragon",
   5,
   345
  ],
  [
   "Fire",
   "Steel",
   20,
   346
  ],
  [
   "Water",
   "Fire",
   20,
   347
  ],
  [
   "Water",
   "Water",
   5,
   348
  ],
  [
   "Water",
   "Grass",
   5,
   349
  ],
  [
   "Water",
   "Ground",
   20,
   350
  ],
  [
   "Water",
   "Rock",
   20,
   351
  ],
  [
   "Water",
   "Dragon",
   5,
   352
  ],
  [
   "Electric",
   "Water",
   20,
   353
  ],
  [
   "Electric",
   "Electric",
   5,
   354
  ],
  [
   "Electric",
   "Grass",
   5,
   355
  ],
  [
   "Electric",
   "Ground",
   0,
   356
  ],
  [
   "Electric",
   "Flying",
   20,
   357
  ],
  [
   "Electric",
   "Dragon",
   5,
   358
  ],
  [
   "Grass",
   "Fire",
   5,
   359
  ],
  [
   "Grass",
   "Water",
   20,
   360
  ],
  [
   "Grass",
   "Grass",
   5,
   361
  ],
  [
   "Grass",
   "Poison",
   5,
   362
  ],
  [
   "Grass",
   "Ground",
   20,
   363
  ],
  [
   "Grass",
   "Flying",
   5,
   364
  ],
  [
   "Grass",
   "Bug",
   5,
   365
  ],
  [
   "Grass",
   "Rock",
   20,
   366
  ],
  [
   "Grass",
   "Dragon",
   5,
   367
  ],
  [
   "Grass",
   "Steel",
   5,
   368
  ],
  [
   "Ice",
   "Water",
   5,
   369
  ],
  [
   "Ice",
   "Grass",
   20,
   370
  ],
  [
   "Ice",
   "Ice",
   5,
   371
  ],
  [
   "Ice",
   "Ground",
   20,
   372
  ],
  [
   "Ice",
   "Flying",
   20,
   373
  ],
  [
   "Ice",
   "Dragon",
   20,
   374
  ],
  [
   "Ice",
   "Steel",
   5,
   375
  ],
  [
   "Ice",
   "Fire",
   5,
   376
  ],
  [
   "Fighting",
   "Normal",
   20,
   377
  ],
  [
   "Fighting",
   "Ice",
   20,
   378
  ],
  [
   "Fighting",
   "Poison",
   5,
   379
  ],
  [
   "Fighting",
   "Flying",
   5,
   380
  ],
  [
   "Fighting",
   "Psychic",
   5,
   381
  ],
  [
   "Fighting",
   "Bug",
   5,
   382
  ],
  [
   "Fighting",
   "Rock",
   20,
   383
  ],
  [
   "Fighting",
   "Dark",
   20,
   384
  ],
  [
   "Fighting",
   "Steel",
   20,
   385
  ],
  [
   "Poison",
   "Grass",
   20,
   386
  ],
  [
   "Poison",
   "Poison",
   5,
   387
  ],
  [
   "Poison",
   "Ground",
   5,
   388
  ],
  [
   "Poison",
   "Rock",
   5,
   389
  ],
  [
   "Poison",
   "Ghost",
   5,
   390
  ],
  [
   "Poison",
   "Steel",
   0,
   391
  ],
  [
   "Ground",
   "Fire",
   20,
   392
  ],
  [
   "Ground",
   "Electric",
   20,
   393
  ],
  [
   "Ground",
   "Grass",
   5,
   394
  ],
  [
   "Ground",
   "Poison",
   20,
   395
  ],
  [
   "Ground",
   "Flying",
   0,
   396
  ],
  [
   "Ground",
   "Bug",
   5,
   397
  ],
  [
   "Ground",
   "Rock",
   20,
   398
  ],
  [
   "Ground",
   "Steel",
   20,
   399
  ],
  [
   "Flying",
   "Electric",
   5,
   400
  ],
  [
   "Flying",
   "Grass",
   20,
   401
  ],
  [
   "Flying",
   "Fighting",
   20,
   402
  ],
  [
   "Flying",
   "Bug",
   20,
   403
  ],
  [
   "Flying",
   "Rock",
   5,
   404
  ],
  [
   "Flying",
   "Steel",
   5,
   405
  ],
  [
   "Psychic",
   "Fighting",
   20,
   406
  ],
  [
   "Psychic",
   "Poison",
   20,
   407
  ],
  [
   "Psychic",
   "Psychic",
   5,
   408
  ],
  [
   "Psychic",
   "Dark",
   0,
   409
  ],
  [
   "Psychic",
   "Steel",
   5,
   410
  ],
  [
   "Bug",
   "Fire",
   5,
   411
  ],
  [
   "Bug",
   "Grass",
   20,
   412
  ],
  [
   "Bug",
   "Fighting",
   5,
   413
  ],
  [
   "Bug",
   "Poison",
   5,
   414
  ],
  [
   "Bug",
   "Flying",
   5,
   415
  ],
  [
   "Bug",
   "Psychic",
   20,
   416
  ],
  [
   "Bug",
   "Ghost",
   5,
   417
  ],
  [
   "Bug",
   "Dark",
   20,
   418
  ],
  [
   "Bug",
   "Steel",
   5,
   419
  ],
  [
   "Rock",
   "Fire",
   20,
   420
  ],
  [
   "Rock",
   "Ice",
   20,
   421
  ],
  [
   "Rock",
   "Fighting",
   5,
   422
  ],
  [
   "Rock",
   "Ground",
   5,
   423
  ],
  [
   "Rock",
   "Flying",
   20,
   424
  ],
  [
   "Rock",
   "Bug",
   20,
   425
  ],
  [
   "Rock",
   "Steel",
   5,
   426
  ],
  [
   "Ghost",
   "Normal",
   0,
   427
  ],
  [
   "Ghost",
   "Psychic",
   20,
   428
  ],
  [
   "Ghost",
   "Dark",
   5,
   429
  ],
  [
   "Ghost",
   "Steel",
   5,
   430
  ],
  [
   "Ghost",
   "Ghost",
   20,
   431
  ],
  [
   "Dragon",
   "Dragon",
   20,
   432
  ],
  [
   "Dragon",
   "Steel",
   5,
   433
  ],
  [
   "Dark",
   "Fighting",
   5,
   434
  ],
  [
   "Dark",
   "Psychic",
   20,
   435
  ],
  [
   "Dark",
   "Ghost",
   20,
   436
  ],
  [
   "Dark",
   "Dark",
   5,
   437
  ],
  [
   "Dark",
   "Steel",
   5,
   438
  ],
  [
   "Steel",
   "Fire",
   5,
   439
  ],
  [
   "Steel",
   "Water",
   5,
   440
  ],
  [
   "Steel",
   "Electric",
   5,
   441
  ],
  [
   "Steel",
   "Ice",
   20,
   442
  ],
  [
   "Steel",
   "Rock",
   20,
   443
  ],
  [
   "Steel",
   "Steel",
   5,
   444
  ]
 ],
 "foresightOnly": [
  [
   "Normal",
   "Ghost",
   0,
   446
  ],
  [
   "Fighting",
   "Ghost",
   0,
   447
  ]
 ],
 "foresightMarkerLine": 445
}

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_main.c#L329-L449// format: attacking type, defending type, damage multiplier // the multiplier is a (decimal) fixed-point number: … TYPE_FORESIGHT, TYPE_FORESIGHT, TYPE_MUL_NO_EFFECT, TYPE_NORMAL, TYPE_GHOST, TYPE_MUL_NO_EFFECT, TYPE_FIGHTING, TYPE_GHOST, TYPE_MUL_NO_EFFECT, TYPE_ENDTABLE, TYPE_ENDTABLE, TYPE_MUL_NO_EFFECTpokeemerald: decompilation of Pokémon Emerald · include/constants/pokemon.h#L5-L23 — type order used for `types` (constants that appear in at least one row)Checked by claude-agent, 2026-10-20 — read every row of src/battle_main.c L329–L449 and the type constants at the pinned commit; probes/pokemon-types/type-charts.mjs re-parses the array and diffs it against this value

Cited by: Pokémon Crystal, Type effectiveness

Emerald keeps the Game Boy encoding, now named TYPE_MUL_*: 20 super effective, 10 normal, 5 not effective, and 0 no effect. pokeemerald/multiplier-encoding

Value

{
 "kind": "multiplier-encoding",
 "neutral": 10,
 "super": 20,
 "notVery": 5,
 "none": 0
}

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · include/battle_main.h#L31-L34#define TYPE_MUL_NO_EFFECT 0 #define TYPE_MUL_NOT_EFFECTIVE 5 #define TYPE_MUL_NORMAL 10 #define TYPE_MUL_SUPER_EFFECTIVE 20Checked by claude-agent, 2026-10-20 — read the defines and the table comment (battle_main.c L329–L334)

Cited by: Pokémon Crystal, Type effectiveness

Emerald's table holds the same 110 rows as Crystal's, in the same order: no new type and no changed matchup. pokeemerald/chart-diff

Value

{
 "kind": "chart-diff",
 "from": "pokecrystal",
 "newTypes": [],
 "changed": []
}

T4 reproducedpokecrystal: disassembly of Pokémon Crystal · data/types/type_matchups.asm#L1-L118pokeemerald: decompilation of Pokémon Emerald · src/battle_main.c#L335-L449Type/Type chart · Type charts: Generations II-VThis matchup table is used from Generation II to Generation V.Checked by claude-agent, 2026-10-20 — the probe parses both tables, compares every cell and the row orderProbe: probes/pokemon-types/type-charts.mjs

Cited by: Pokémon Crystal, Pokémon Emerald, Type effectiveness

TYPE_MYSTERY (9), named "???", sits between the physical and special types and has no rows. pokeemerald/mystery-type

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · include/constants/pokemon.h#L15#define TYPE_MYSTERY 9pokeemerald: decompilation of Pokémon Emerald · src/battle_main.c#L462[TYPE_MYSTERY] = _("???"),Checked by claude-agent, 2026-10-20 — read the constants and the type-name table; the probe lists type constants with no rows (Mystery only)Probe: probes/pokemon-types/type-charts.mjs

Cited by: Type effectiveness

Before the type chart, Cmd_typecalc applies STAB as $damage \times 15 / 10$ when either attacker type equals the move's type. pokeemerald/stab

About: Pokémon Emerald Same-type attack bonus

Value

{
 "kind": "stab",
 "form": "mul-div",
 "mul": 15,
 "div": 10
}

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1368-L1373 // check stab if (IS_BATTLER_OF_TYPE(gBattlerAttacker, moveType)) { gBattleMoveDamage = gBattleMoveDamage * 15; gBattleMoveDamage = gBattleMoveDamage / 10; }pokeemerald: decompilation of Pokémon Emerald · include/battle.h#L471 — IS_BATTLER_OF_TYPE tests types[0] or types[1]Checked by claude-agent, 2026-10-20 — read Cmd_typecalc L1355–L1424

For non-negative integers $⌊ 15 d / 10 ⌋$ equals the Game Boy games' $d + ⌊ d / 2 ⌋$ , so STAB's arithmetic did not change, only its form.

Cited by: Pokémon Crystal, Same-type attack bonus, Type effectiveness

For each row of the move's type, ModulateDmgByType runs once per distinct target type it matches: $damage \times multiplier / 10$ , raised from 0 to 1 unless the multiplier is 0. pokeemerald/type-step

Value

{
 "kind": "type-step",
 "div": 10,
 "zero": "min1"
}

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1321-L1325 gBattleMoveDamage = gBattleMoveDamage * multiplier / 10; if (gBattleMoveDamage == 0 && multiplier != 0) gBattleMoveDamage = 1;pokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1386-L1406 if (TYPE_EFFECT_DEF_TYPE(i) == gBattleMons[gBattlerTarget].types[1] && gBattleMons[gBattlerTarget].types[0] != gBattleMons[gBattlerTarget].types[1])Checked by claude-agent, 2026-10-20 — read ModulateDmgByType and the loop in Cmd_typecalc

Cited by: Pokémon Crystal, Type effectiveness

The text comes from flags ModulateDmgByType sets per row: a 2× row cancels an earlier not-very-effective flag, a ½ row an earlier super-effective one, and ×0 sets "doesn't affect", clearing both. pokeemerald/effectiveness-message

Value

{
 "kind": "message",
 "rule": "flags"
}

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1327-L1352 case TYPE_MUL_SUPER_EFFECTIVE: if (gBattleMoves[gCurrentMove].power && !(gMoveResultFlags & MOVE_RESULT_NO_EFFECT)) { if (gMoveResultFlags & MOVE_RESULT_NOT_VERY_EFFECTIVE) gMoveResultFlags &= ~MOVE_RESULT_NOT_VERY_EFFECTIVE; else gMoveResultFlags |= MOVE_RESULT_SUPER_EFFECTIVE; }Checked by claude-agent, 2026-10-20 — read the switch in ModulateDmgByType

Cited by: Pokémon Crystal, Pokémon Emerald, Type effectiveness

Against a Foresight target, the loop breaks at the TYPE_FORESIGHT row, skipping the Normal→Ghost and Fighting→Ghost immunities after it. pokeemerald/foresight

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1388-L1394 if (TYPE_EFFECT_ATK_TYPE(i) == TYPE_FORESIGHT) { if (gBattleMons[gBattlerTarget].status2 & STATUS2_FORESIGHT) break;pokeemerald: decompilation of Pokémon Emerald · src/battle_main.c#L445-L447Checked by claude-agent, 2026-10-20 — read the loop and the table tail

Cited by: Type effectiveness

Struggle skips Cmd_typecalc entirely, so neither STAB nor the type chart touches it. pokeemerald/struggle-skips

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1360-L1364 if (gCurrentMove == MOVE_STRUGGLE) { gBattlescriptCurrInstr++; return; }Checked by claude-agent, 2026-10-20 — read the function entry

Cited by: Same-type attack bonus, Type effectiveness

Cmd_typecalc flags a Ground move against a Levitate target as missed and “doesn't affect”, and walks no type row. pokeemerald/levitate

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1375-L1384 if (gBattleMons[gBattlerTarget].ability == ABILITY_LEVITATE && moveType == TYPE_GROUND) { gLastUsedAbility = gBattleMons[gBattlerTarget].ability; gMoveResultFlags |= (MOVE_RESULT_MISSED | MOVE_RESULT_DOESNT_AFFECT_FOE);Checked by claude-agent, 2026-10-20 — read Cmd_typecalc

Cited by: Pokémon Emerald, Type effectiveness

After the rows, a Wonder Guard target makes a damaging move miss on the turn it attacks, unless the move carries the super-effective flag without the not-very-effective one. pokeemerald/wonder-guard

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1409-L1419 if (gBattleMons[gBattlerTarget].ability == ABILITY_WONDER_GUARD && AttacksThisTurn(gBattlerAttacker, gCurrentMove) == 2 && (!(gMoveResultFlags & MOVE_RESULT_SUPER_EFFECTIVE) || ((gMoveResultFlags & (MOVE_RESULT_SUPER_EFFECTIVE | MOVE_RESULT_NOT_VERY_EFFECTIVE)) == (MOVE_RESULT_SUPER_EFFECTIVE | MOVE_RESULT_NOT_VERY_EFFECTIVE))) && gBattleMoves[gCurrentMove].power)Checked by claude-agent, 2026-10-20 — read Cmd_typecalc; AttacksThisTurn's meaning (2 = attacks this turn, not a charge turn) taken from its name and not traced further

Cited by: Pokémon Emerald, Type effectiveness

Row order still matters: an Ice move against Water/Flying takes 3 damage to 1, then 2 (½ row at L369, 2× at L373). pokeemerald/truncation-order

T4 reproducedpokeemerald: decompilation of Pokémon Emerald · src/battle_main.c#L369-L373 TYPE_ICE, TYPE_WATER, TYPE_MUL_NOT_EFFECTIVE, … TYPE_ICE, TYPE_FLYING, TYPE_MUL_SUPER_EFFECTIVE,Checked by claude-agent, 2026-10-20 — read the rows and ModulateDmgByType; the probe replays itProbe: probes/pokemon-types/type-charts.mjs

Cited by: Type effectiveness

Type still decides physical or special in Emerald, by its position relative to TYPE_MYSTERY. pokeemerald/physical-special-by-type

About: Pokémon Emerald Damage formula

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · include/battle.h#L466-L467#define IS_TYPE_PHYSICAL(moveType) (moveType < TYPE_MYSTERY) #define IS_TYPE_SPECIAL(moveType) (moveType > TYPE_MYSTERY)Checked by claude-agent, 2026-10-20 — read the macros and their use in src/pokemon.c (L3232, L3287)

Cited by: Damage formula, Type effectiveness

A plain damaging move runs critcalc, damagecalc (base damage), typecalc (STAB, then type rows), and then adjustnormaldamage (random factor). pokeemerald/damage-order

About: Pokémon Emerald Damage formula

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · data/battle_scripts_1.s#L249-L252 critcalc damagecalc typecalc adjustnormaldamageChecked by claude-agent, 2026-10-20 — read BattleScript_EffectHit and Cmd_adjustnormaldamage (L1658–L1662)

Unlike the Game Boy games, the accuracy check (accuracycheck, L244) comes before damage is computed.

Cited by: Damage formula, Type effectiveness

The random factor changes form: damage × (100 − rand % 16) / 100, i.e. 85–100 %, raised to 1 if that gives 0. pokeemerald/random-factor

About: Pokémon Emerald Damage formula

Value

[
 85,
 100
]

T3 code-verifiedpokeemerald: decompilation of Pokémon Emerald · src/battle_script_commands.c#L1639-L1651 u16 randPercent = 100 - (rand % 16); … gBattleMoveDamage *= randPercent; gBattleMoveDamage /= 100;Checked by claude-agent, 2026-10-20 — read ApplyRandomDmgMultiplier

Cited by: Damage formula, Type effectiveness