Hidden Abilities - Rangi42/polishedcrystal GitHub Wiki

An individual Pokémon can have a Hidden Ability as in Gen. V+. There are some additional features in this game.

Main database: move_mon.asm, daycare.asm, odd_eggs.asm, wonder_trade.asm

  • General encounters have a 5% chance of Hidden Ability.
    • The general ratio is A1 : A2 : HA = 47.5% : 47.5% : 5%.
  • The stat screen now displays the number of Ability with its name: 1, 2, or H.
  • Those spawning in Hidden Grottoes and hatching from the Odd Egg are guaranteed to have their Hidden Ability.
  • Those from Wonder Trade have a 1/3 chance of Hidden Ability.
  • The Ability Patch is available as a Battle Tower reward.
  • The Ability Capsule and the Ability Patch have a new effect: when held by parents on breeding, they now give a 25% chance, for each parent holding it, that their offspring has the Hidden Ability.
    • The female (or non-Ditto) parent now has a 60% chance of passing its Ability down to its offspring after the held-item check above, no matter which Ability it is.
    • These new features max out the total chance of Hidden-Ability offspring at 81%. (0.25 * 2 + 0.5 * (0.6 + 0.4 * 0.05) = 0.81)