Breeding Lifecycle

An addition to a breeding system, not a breeding system of its own. After each breeding, Breeding Lifecycle decides whether each parent is lost, with a chance that grows with every breeding that parent has done, instead of always consuming both parents.

What it needs

The breeding itself comes from one of three places:

• Your server's daycare, calling the one-call Java API BreedingLifecycle.evaluate(parentA, parentB) after it breeds;
• A breeding mod that fires Cobblemon's COLLECT_EGG event with the real parents, through the bundled adapter (eggEventAdapter.enabled);
• The reference daycare included in the mod (/daycare), off by default, to try the curve in game.

How it works

For a parent's n-th breeding the loss chance is p(n) = 1 − (1 − p1) · r^(n−1), reaching 1 at maxBreedings when one is set. With the default curve (p1 = 0.33, r = 0.764) a parent is lost with a 33 % chance on its first breeding, then 49 %, 61 %, 70 % and 77 %; on average it gives 2.20 offspring before it is lost, against 1 when both parents are always consumed. Ditto has its own curve. Each Pokémon carries its own breeding counter, so the chance follows it through the PC and trades.

Features

• Server-only: players install nothing. Messages are translated on the server into English or Spanish, following each client's language.
• config/breeding-lifecycle.json with presets and field-by-field overrides; invalid values are reported with their field, value and range. /breedinglifecycle reload (or vanilla /reload) applies changes.
• /breedinglifecycle info <1-6> shows a party Pokémon's breedings and the loss chance of its next breeding; /breedinglifecycle curve prints the active curves.
• Every roll is written to logs/breeding-lifecycle/audit.jsonl.
• The reference daycare honours Cobbreeding's neutered flag.

Requirements

Minecraft 1.21.1, Fabric Loader 0.19.2 or newer, Fabric API, Fabric Language Kotlin and Cobblemon 1.7.3+1.21.1 or newer, on the server. Java 21.

Links

Source, documentation, a command-line simulator and a web simulator of the curve: https://github.com/bernhardtwo/cobblemon-breeding-lifecycle

MIT licensed. Bundles Server Translations API (MIT), which nests Packet Tweaker (LGPLv3).