
Cobblemon Shiny Days
Choose days of the week to increase shiny rates for either all Pokémon or specific Pokémon, giving your server events similar to Community Days in Pokémon GO.
About this Mod

Choose days of the week to increase shiny odds for either all Pokémon or specific Pokémon, giving your server events similar to Community Days in Pokémon GO.
Dependencies
Cobblemon - Modrinth / Curseforge
Fabric Language Kotlin (for Fabric servers) - Modrinth / Curseforge
Features
- Choose which days to increase shiny rates
- Increase shiny odds for all spawns or only specific Pokémon
- Broadcasts a message at a customisable interval to remind players what shiny rates are currently increased
- /shinyday command to check currently boosted shiny rates
Installation
Place the .jar file in your /mods folder, and restart the server.
Configuration
The configuration has 5 customisable options
- "species" : which Pokémon will have increased rates (can use "ALL" to increase odds of all Pokémon)
- "labels" : Pokémon with these labels will have their shiny rates increased ("legendary", "gen1", "gen2" etc.)
- "types" : Pokémon with these types will have their shiny rates increased ("water", "fire" etc.)
- "days" : which days to apply the specified rates to the specified Pokémon
- "multiplier" : how much to multiply odds by (uses the shiny rates in your Cobblemon config as a base rate, then adds this modifier) e.g. Cobblemon shiny rate is 1/8192, a multiplier of 2.0 will make the rate 1/4096
- "broadcastInterval" : how often to send the broadcast (in seconds) letting players know which Pokémon have increased shiny rates.
Example Config
[
{
"species": ["Pikachu", "Bulbasaur", "Charmander", "Squirtle"],
"labels": ["legendary", "mythical"],
"types": ["normal"],
"days": ["Saturday", "Sunday"],
"multiplier": 5.0,
"broadcastInterval": 300
},
{
"species": [],
"labels": ["gen1"],
"types": ["water"],
"days": ["Monday"],
"multiplier": 2.0,
"broadcastInterval": 300
},
{
"species": [],
"labels": ["gen2"],
"types": ["fire"],
"days": ["Tuesday"],
"multiplier": 2.0,
"broadcastInterval": 300
},
{
"species": [],
"labels": ["gen3"],
"types": ["grass"],
"days": ["Wednesday"],
"multiplier": 2.0,
"broadcastInterval": 300
},
{
"species": [],
"labels": ["gen4"],
"types": ["psychic"],
"days": ["Thursday"],
"multiplier": 2.0,
"broadcastInterval": 300
},
{
"species": [],
"labels": ["gen5"],
"types": ["steel"],
"days": ["Friday"],
"multiplier": 2.0,
"broadcastInterval": 300
}
]
The config above would work as follows
Saturday and Sunday - Pikachu, Bulbasaur, Charmander, Squirtle, Normal-type, legendary and mythical Pokemon have 5x shiny rates
Monday - All Gen 1 & Water-type Pokemon have 2x shiny rates
Tuesday - All Gen 2 & Fire-type Pokemon have 2x shiny rates
Wednesday - All Gen 3 & Grass-type Pokemon have 2x shiny rates
Thursday - All Gen 4 & Psychic-type Pokemon have 2x shiny rates
Friday - All Gen 5 & Steel-type Pokemon have 2x shiny rates
Authors
Created by Shadymitsu and ChatGPT
License
Available Versions
How to Install Cobblemon Shiny Days on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).
Install Mod
Open the mod browser in the dashboard and search for "Cobblemon Shiny Days". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.1
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Cobblemon Shiny Days server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.
Is Cobblemon Shiny Days compatible with fabric and neoforge?
Cobblemon Shiny Days officially supports fabric, neoforge for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Cobblemon Shiny Days – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Cobblemon Shiny Days consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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