CobGyms - Unofficial Cobblemon Gyms

Gym Entrance structures spawn naturally in the overworld and send a player into a specific themed Gym, and each player can use one a maximum of 3 times. A Poké Gym Key sends the player into a random themed Gym instead. Three Gym themes are implemented: Woodland, Volcanic and Aquatic. Teams for the Gym Leader and the Gym Trainers are drawn from a set chosen for the theme, then adjusted to the level of the Gym Pokémon, and evolutions are applied automatically. Losing or forfeiting a battle causes a whiteout that ejects the player with no rewards.

Clearing a Gym grants Poké Shards in four tiers, Lesser, Adept, Master and Legendary, each tier dropping within its own band of Gym Pokémon levels, with higher levels raising the odds of stronger rewards. Shards craft into a Poké Cache of the matching rarity or dismantle into a lower rarity. Opening a cache with a chosen theme gives a random Pokémon from a fixed list, starting at level 1. Surrounding a cache with shards of the same rarity makes a Shiny variant with a 1/50 chance.

The mod requires Architectury API, Cobblemon, CobblemonTrainers (Discontinued), Fabric API on Fabric and Kotlin for Forge on Forge. It runs on client and server and is released under the Mozilla Public License 2.0, with the source code public. Builds cover 1.20.1 and 1.21.1, with the latest Fabric and NeoForge files for 1.21.1.