Ocean

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.

Ocean Biomes
minecraft:frozen_ocean	minecraft:ocean	minecraft:cold_ocean
minecraft:lukewarm_ocean	minecraft:warm_ocean	minecraft:deep_frozen_ocean
minecraft:deep_cold_ocean	minecraft:deep_ocean	minecraft:deep_lukewarm_ocean
minecraft:stony_shore	minecraft:beach	minecraft:snowy_beach
terralith:basalt_cliffs	terralith:granite_cliffs	terralith:white_cliffs
terralith:frozen_cliffs	wythers:deep_icy_ocean	wythers:icy_ocean
wythers:calcite_coast	wythers:coastal_mangroves	wythers:cold_island
wythers:cold_stony_shore	wythers:deepslate_shore	wythers:frigid_island
wythers:frozen_island	wythers:gravelly_beach	wythers:icy_shore
wythers:mediterranean_island	wythers:temperate_island	wythers:tropical_island
wythers:warm_stony_shore	wythers:guelta	wythers:sand_dunes