During a developer AMA, a Response to 'How does it compare to Pokémon?': "Each has their own charms and both can coexist, we don't like to say better than or worse than.
Different, however: different creatures, online, 100% doable in co-op with friends, Stamina system in battle instead of PPs, double battles, no RNG in combat whatsoever, chat, mounts, housing, character personalization, community feedback gets implemented, and you have direct interaction with the devs."