I saw a certain "leak" (not sure if I'm allowed to post those here), that had some pretty interesting ideas.
An electric gazelle, a normal/steel sheep, water/ground manatee, ground/fairy mole, fighting-type kangaroo.
Also a narwhal line.
Regional rodent in said leak was a hamster that allegedly becomes Normal/Grass, regional bird was a stork (water/flying), bug was a grasshopper(bug/fire or bug/fighting, not sure which). Also legendary quartet based based on the Chinese mythical guardians (think the Four Holy Beasts from Digimon). And last but not least, the fossils! A rock/grass giant ground sloth and a rock/ice saber-toothed cat.
You mean this one?
810. Grookey Grass
811. Grass
812. Grass/Steel
813. Scorbunny Fire
814. Fire
815. Fire/Fairy
816. Sobble Water
817. Water
818. Water/Dragon
819. Hamster Normal
820. Hamster Normal/Grass
821. Hatchling Flying/Normal
822. Stork Flying/Water
823. Grasshopper Bug
824. Grasshopper Bug/Fighting
825. Red Squirrel Fire
826. Pig Normal
827. Warthog Normal
828. Potato Grass/Ground (Version Exclusive)
829. Potato Flower Grass/Poison (Version Exclusive)
830. Root Grass (Version Exclusive)
831. Root Grass/Ice (Version Exclusive)
832. Goldfish Water
833. Oranda Water/Psychic
834. Dog Electric
835. Greyhound Electric
836. Teapot Fairy
837. Ant Larvae Bug
838. Fire Ant Bug/Fire
839. Peanut Ant Bug/Flying(Dragon?)
840. Sheep Normal
841. Sheep Normal/Steel
842. Badger Normal/Ground
843. Badger Normal/Ground
844. Rune Stone Rock
845. Rune Stone Rock/Psychic
846. Rat Normal/Poison
847. Haunted Clock Ghost
848. Haunted Clock Ghost
849. Manatee Water
850. Manatee Water/Ground
851. Male Fencer Fighting/Steel
852. Female Fencer Fighting/Steel
853. Pretty Toad Poison/Psychic
854. Ugly Toad Poison/Psychic
855. Giant Sloth Rock/Grass
856. Giant Sloth Rock/Grass
857. Sabretooth Tiger Rock/Ice
858. Sabretooth Tiger Rock/Ice
859. Bat Flying/Dark
860. Bat Flying/Dark
861. Mole Ground/Fairy
862. Star-Nosed Mole Ground/Fairy
863. Porcupine Steel
864. Gazelle Electric
865. Gazelle Electric/Fire
866. Slug Ground
867. Snail Ground/Rock
868. Pika Jerboa Electric/Fighting
869. Komodo Dragon Dragon/Poison
870. Ivy Grass
871. Poison Ivy Grass/Poison
872. Steel Eeveelution Steel
873. Sheet Ghost Ghost
874. Ghost Armor Ghost/Steel
875. Ghost Knight Ghost/Steel
876. Nose Bear Fairy (Version Exclusive)
877. Ferret Dark (Version Exclusive)
878. Flea Bug
879. Tarsier Dark/Poison
880. Alpaca Normal/Ice
881. Alpaca Normal/Ice
882. Narwhal Water
883. Narwhal Water/Fighting
884. Robot Steel/Electric
885. Robot Steel/Electric
886. Snowman Ice
887. Snowman Ice
888. Thorny Lizard Ground/Fire
889. Kangaroo Normal
890. Kangaroo Fighting
891. Unicorn Fairy
892. Nessie Dark/Water
893. Dragon Egg Dragon
894. Baby Dragon Dragon/Ice
895. Ice Dragon Dragon/Ice
896. Metal Cobra Steel/Poison (Version Exclusive)
897. Trojan Horse Steel/Grass (Version Exclusive)
898. Wolf Steel/Fighting (Version Exclusive)
899. Wolf Steel/Fighting (Version Exclusive)
900. (North) Turtle Steel/Water
901. (East) Western Dragon Dragon/Electric
902. (South) Phoenix Fire/Water
903. (West)Tiger Normal/Dark
904. Plague Doctor Ghost/Poison
905. Geolyph Giant Fire/Ice