Hills

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.

Hills Biomes
minecraft:windswept_hills	minecraft:windswept_forest	minecraft:windswept_gravelly_hills
minecraft:savanna_plateau	minecraft:wooded_badlands	minecraft:grove
minecraft:snowy_slopes	minecraft:meadow	terralith:alpine_highlands
terralith:arid_highlands	terralith:blooming_plateau	terralith:highlands
wythers:bamboo_jungle_highlands	wythers:eucalyptus_deanei_forest	wythers:forested_highlands
wythers:highlands	wythers:huangshan_highlands	wythers:highland_tropical_rainforest
wythers:jade_highlands	wythers:wistman_woods	terralith:blooming_valley
terralith:forested_highlands	terralith:lavender_valley	terralith:lush_valley
terralith:moonlight_valley	terralith:sakura_valley	terralith:savanna_slopes
terralith:temperate_highlands	terralith:yosemite_lowlands	wythers:autumnal_crags
wythers:ayers_rock	wythers:icy_crags	wythers:old_growth_taiga_crags
wythers:taiga_crags	wythers:temperate_rainforest_crags	wythers:thermal_taiga_crags
wythers:windswept_jungle