To prevent overflow of biomes listed in unregistered pokemon gui, especially when biome mods are added such as BYG or BOP, maybe a config option to group the biomes into biome groups would make sense. Similar to what's in the betterspawning config, as an example, everything under mountainous will just be displayed as mountainous biomes then they can click on it to get the real list via /wiki command

"mountainous": [
  "minecraft:mountains",
  "minecraft:mountain_edge",
  "minecraft:wooded_mountains",
  "minecraft:gravelly_mountains",
  "minecraft:modified_gravelly_mountains",
  "pixelmon:ultra_rocky",
  "pixelmon:ultra_crater",
  "pixelmon:ultra_cliff",
  "biomesoplenty:alps",
  "biomesoplenty:alps_foothills",
  "biomesoplenty:highland",
  "biomesoplenty:highland_crag",
  "biomesoplenty:highland_moor",
  "biomeoplenty:jade_cliffs",
  "byg:alpine_foothills",
  "byg:alps"

Perhaps worth re-visiting in 1.20.1 with biome tags? Thoughts? @SnowBlitzz

Perhaps worth re-visiting in 1.20.1 with biome tags? Thoughts? @SnowBlitzz

yeah sounds good. I think there can even be some way to make it "expand" by if they need the full biome list