Pokémon Ruby and Sapphire (pret/pokeruby)

Ruby and Sapphire's atk04_critcalc, which Emerald keeps apart from a renamed helper, sums Focus Energy (+2), a move whose effect is high-critical, Sky Attack, Blaze Kick, or Poison Tail (+1), a Scope Lens (+1), and Lucky Punch or Stick on their species (+2), caps the stage at 4, and hits critically 1 time in 16, 8, 4, 3, or 2. Battle Armor or Shell Armor on the target, the STATUS3_CANT_SCORE_A_CRIT flag on the attacker, Wally's tutorial, and the first battle rule it out. pokeruby/critical-chance

About: Pokémon Ruby and Sapphire Critical hit

{
 "oneIn": [
  16,
  8,
  4,
  3,
  2
 ]
}

Cited by: Ability, Critical hit, Pokémon Ruby and Sapphire

Ruby and Sapphire's atk01_accuracycheck, which Emerald keeps with renamed constants, scales a move's percent accuracy by one combined stage ratio, applies Compound Eyes (×1.3), Sand Veil in a sandstorm and Hustle on physical moves (×0.8 each), and a target's evasion item, and misses when a roll from 1 to 100 exceeds the result. pokeruby/hit-test

About: Pokémon Ruby and Sapphire Hit chance

Cited by: Hit chance, Pokémon Ruby and Sapphire

Ruby and Sapphire's gTypeEffectiveness holds the same 110 rows as Emerald's and Crystal's, in the same order, with literal 0xFE and 0xFF bytes where Emerald names TYPE_FORESIGHT and TYPE_ENDTABLE. pokeruby/type-chart

About: Pokémon Ruby and Sapphire Type effectiveness

Cited by: Type effectiveness

Ruby and Sapphire's atk06_typecalc applies STAB as $\mathrm{damage}\times 15/10$ before the type rows, as Emerald's Cmd_typecalc does. pokeruby/stab

About: Pokémon Ruby and Sapphire Same-type attack bonus

Cited by: Same-type attack bonus

Ruby and Sapphire already use Emerald's random factor, damage × (100 − rand % 16) / 100, raised to 1 if that gives 0; Gen 1 and 2 reach about the same 85–100% spread as a byte from 217 to 255 over 255. pokeruby/random-factor

About: Pokémon Ruby and Sapphire Damage formula

Cited by: Damage formula, Pokémon Ruby and Sapphire

Ruby and Sapphire's atk8D_setmultihitcounter gives 2 or 3 hits with probability 3/8 each and 4 or 5 with 1/8 each, the same code as Emerald's; the multi-hit battle script runs accuracycheck once and then loops critcalc, damagecalc, and adjustnormaldamage for every hit. pokeruby/multi-hit

About: Pokémon Ruby and Sapphire Multi-hit attack

Cited by: Multi-hit attack

Ruby and Sapphire multiply the area's encounter rate by 16, cut it to 80% on the Mach or Acro Bike, apply the flute and Cleanse Tag modifiers, halve it for a lead with Stench and double it for Illuminate, cap it at 2,880, and start a battle when Random() % 2880 is below it. Emerald keeps the roll and adds more ability modifiers. pokeruby/encounter-rate

About: Pokémon Ruby and Sapphire Random encounter

Cited by: Random encounter

Ruby and Sapphire's TryRunFromBattle always escapes with a Smoke Ball or Run Away; otherwise, in a single battle, a Pokémon at least as fast as the foe escapes, and a slower one when $\lfloor 128P/E\rfloor +30t$, for $t$ earlier tries, beats a random byte. Emerald adds only the Battle Pyramid's and Frontier's rules. pokeruby/run

About: Pokémon Ruby and Sapphire Fleeing

Cited by: Ability, Fleeing, Pokémon Ruby and Sapphire

Ruby and Sapphire's GetWhoStrikesFirst puts the higher-priority move first; at equal priority the higher adjusted Speed goes first, and a tie is a coin flip. Adjusted Speed applies stat stages, doubles for Swift Swim in rain or Chlorophyll in sun, takes ×1.1 for the player's Pokémon with the third badge outside link battles, halves with a Macho Brace, and quarters under paralysis; a held Quick Claw sets it to the maximum when a per-turn random number is below its parameter, 20, as a percent of 0xFFFF. pokeruby/turn-order

About: Pokémon Ruby and Sapphire Turn order

{
 "quickClawPercent": 20
}

Cited by: Held item, Turn order

Ruby and Sapphire define 77 abilities, from Stench (1) to Air Lock (77); a species lists one or two, and when it has two, the lowest bit of the Pokémon's personality value picks which. pokeruby/abilities

About: Pokémon Ruby and Sapphire Ability

{
 "count": 77
}

Cited by: Ability, Pokémon Ruby and Sapphire

A Ruby and Sapphire Pokémon's nature is its personality value mod 25; each of the 25 raises one stat other than HP by 10% and lowers another by 10%, rounded down, except Hardy, Docile, Serious, Bashful, and Quirky, which change nothing. pokeruby/natures

About: Pokémon Ruby and Sapphire Nature

{
 "count": 25,
 "up": 1.1,
 "down": 0.9
}

Cited by: Nature, Pokémon Ruby and Sapphire

In Ruby and Sapphire, rain, sandstorm, or drought on the overworld starts a battle in that weather with no turn limit, Drizzle sets lasting rain when its holder enters, and Cloud Nine or Air Lock on the field turns weather's effects off. pokeruby/weather

About: Pokémon Ruby and Sapphire Weather

Cited by: Pokémon Ruby and Sapphire, Weather