Magical

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.

Magical Biomes
minecraft:dark_forest	terralith:amethyst_canyon	terralith:amethyst_rainforest
terralith:mirage_isles	terralith:moonlight_grove	terralith:moonlight_valley
byg:skyris_vale	byg:enchanted_tangle	byg:twilight_meadow
wythers:lantern_river	wythers:mushroom_island	wythers:snowy_thermal_taiga
wythers:is_dark_forest