Desert

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.

Desert Biomes
minecraft:desert	terralith:ancient_sands	terralith:desert_canyon
terralith:cave/desert_caves	terralith:desert_oasis	terralith:desert_spires
terralith:lush_desert	terralith:red_oasis	terralith:sandstone_valley
byg:atacama_desert	byg:mojave_desert	byg:windswept_desert
wythers:is_desert	wythers:badlands_desert	wythers:desert_island
wythers:kwongan_heath	wythers:outback_desert	wythers:red_desert
wythers:sandy_jungle