Dense

Spawning data tags simply contain a list of Biomes. If you're referring to this list for a Pokemon, please double-check if it has an Anti Condition or Anti Biome. Anti Conditions and Anti Biomes are a way to essentially state: not in this biome/condition, so you'll need to cross-reference them. For instance, if a Pokemon is set to spawn in is_ocean, but has an anti condition of is_cold, it will not spawn in cold oceans.

Our Pokemon spawns are generally based on default Cobblemon configurations with additions to allow the entire dex to spawn in all Minecraft biomes and supported biome mods. Most biome mods are supported such as Terralith, Oh Biomes You'll Go, Incendium, Better Nether, Gardens of the Dead, and The Bumblezone. Other biome mods may also be compatible, provided they label their biomes with data tags.

Dense Biomes
minecraft:dark_forest	minecraft:mangrove_swamp	minecraft:bamboo_jungle
minecraft:jungle	minecraft:sparse_jungle	terralith:cave/underground_jungle
wythers:dripleaf_swamp	wythers:eucalyptus_deanei_forest	wythers:highland_tropical_rainforest
wythers:humid_tropical_grassland	wythers:jungle_canyon	wythers:subtropical_forest
wythers:subtropical_forest_edge	wythers:subtropical_grassland	wythers:tropical_forest
wythers:tropical_forest_canyon	wythers:tropical_grassland	wythers:tropical_island
wythers:tropical_rainforest