Breeding

Happy breeding!

Notable Mechanics

See also: breeding.asm, daycare.asm; Modifications

• Egg Groups: see Pokémon list
• Egg Moves (egg_moves.asm)
  • The male parent passes them first, then the female.
• Mr. PKMN will now exchange your Red Scale with a perfect-IV (6IV) Shiny Ditto.
• Forms are now inheritable. If the parents are the same species with different forms, either of the two will pass its form to their offspring (50% chance each); otherwise the female (or non-Ditto) parent will. Everstone has no effects on forms.
• The caught Poké Ball is also inheritable in the same way.
• The Everstone for passing Nature, the Power items for the corresponding IVs, and the Destiny Knot for five IVs instead of three are all available.
• The Ability Capsule is now effective when held by parents. It gives a 25% chance of producing Hidden Ability offspring for each parent holding it.
• After the Ability Capsule check, the female (or non-Ditto) parent now has a 60% chance of passing its Ability, no matter which Ability it has.
• The Masuda method is available for Shiny breeding. It's now triggered by a couple of different OTIDs (instead of different languages).
  • Since Shininess is now independent from IVs, parents' Shininess has no impact on their offspring.
• Nidoran-F has an equal chance of having Nidoran-F or Nidoran-M as her offspring.
• Nidorina and Nidoqueen can now breed as part of the Monster/Field Group.

Notes:

• There's an oversight where the form inheritance can lead to a hatch of the event-exclusive offspring. It'll be resolved in the upcoming 9-bit Pokémon-ID update.
• Online features for Polished have been suggested, which may lead to further modification on the in-game Masuda Method.

Efficient Breeding

0. Groundwork:
   1. Get a Pokémon with Synchronize for each of the good Natures
      • Abra comes in handy at Goldenrod Game Corner
      • You'll at least want Jolly, Timid, Adamant, Modest, Bold, Impish, Calm, and Careful
   2. Get a Pokémon with Flame Body or Magma Armor
   3. Get a parent of the desired Nature with the help of the corresponding Synchronizer
      • If you can't for some reason (e.g. your Starter), consider catching a Ditto of the desired Nature instead
   4. Find out Egg Moves you want and get a male parent who learns the desired moves
1. Begin breeding while making the most of inheritances, preferably in the following order with the parent(s) to be replaced as needed:
   1. Nature with an Everstone + Egg Moves
   2. Ability
   3. and IVs with a Destiny Knot and a 6IV Ditto (Mr. PKMN's Ditto will also turn on the modded Masuda method for Shiny breeding!)
2. Hatch Eggs while speeding it up with Flame Body or Magma Armor
3. Keep breeding with a 4IV parent and the 6IV Ditto

Spend wisely Ability Capsules/Patches for Ability swaps and Bottle Caps for IV upgrades. Unfortunately, Mints for Nature swaps are not effective yet; they'll be in full use in the upcoming 9-bit update.

Trivia

• In the main series games, it's since the debut of breeding that Nidoran-F can give birth to both Nidorans and that Nidorina and Nidoqueen belong to the No Eggs Discovered Group.
  • Nidorina's loss of its breeding capacity was already designed prior to the in-game breeding mechanics, as described in the lore chapter of the Japanese semi-official book Pocket Monster Zukan (1996, Aspect Corp.); the book is one of the oldest Pokémon guidebooks, and was supervised by Ishihara, co-written by the then Game Freak publication department chief Tomisawa with GF's direct-feed data, and published five weeks after the Japanese Red/Green release.