This data-pack is an addon for Cobblemon, which makes it work better with Snow biomes, as they no longer sink & take damage in powder snow, but instead stand on top of it. This applies to all Cobblemon, regardless of type, size or weight.
The data pack adds a line to the powder_snow_walkable_mobs entity type to include the "Cobblemon:Pokemon" entity, the same way the base game handles Endermites, Rabbits, Foxes and Silverfish.