In your own world, shiny hunting has a config file. A few values in config/cobblemon/main.json control how often shinies roll, how many Pokémon spawn, and where they appear — and tuning them honestly is the difference between a months-long grind and a hobby that fits your evenings. Edit with the game closed, and keep a backup of the file before changing anything.
(On a server, these values belong to the server. This guide is for your single-player worlds.)
shinyRate — the big one
shinyRate defaults to 8192, meaning 1 in 8,192 spawns is shiny. Lower is better for hunting: 4096 matches the modern games' base rate, 2048 feels generous without being trivial, and anything below ~512 turns shinies from an event into a routine. Pick the number that matches how much you want each find to mean.
Spawn volume: pokemonPerChunk and tick rate
Shinies per hour equals spawns per hour divided by the rate, so the other half of the equation is volume:
pokemonPerChunk(default 1.0) — the density ceiling. Raising it to 2–3 visibly thickens spawns; big values cost performance, so step up gradually.ticksBetweenSpawnAttempts(default 20, i.e. one attempt per second) — lowering it makes the world roll spawns more often. Halving it roughly doubles attempts; watch your frame times.
Minecraft's own settings matter too: spawns only tick in loaded chunks, so a simulation distance that covers your hunting loop keeps the whole loop productive.
The setting nobody checks: spawn distance
Cobblemon rolls spawns in a ring between minimumSliceDistanceFromPlayer (default 16 blocks) and maximumSliceDistanceFromPlayer (default 64 blocks). Read that again: by default, most spawns happen 16–64 blocks away — behind trees, over ridges, in the cave under your feet. Your shinies are rolling at the edge of (or beyond) what you can actually see, which is why long hunts quietly bleed rolls.
Close the visibility gap
You can tune the config so more shinies exist, but the spawn ring means you still have to notice them. CobbleVision covers that half: a shiny alert (sound, flash, chat line) the tick one spawns anywhere in range, a gold box and tracer pointing to it through terrain, and a radar that turns the whole 64-block ring into a minimap. Config tuning plus alerts is the complete setup — more rolls, and none of them wasted. See the full method in our shiny hunting guide.