A lot of the Megas are just spikes or stripes added, and that’s a real shame.
But the basic Pokemon design has not really changed at all.
All Generations have had their fair share of Animal based designs, and designs based on outrageous inanimate objects. Granted the earlier designs were more obviously based on Animals, but thats because they really did use up a lot of Animals. They can’t just keep rehashing.
Animals
(Every Generation has had multiple Bird designs so I left that out)
Generation 1: Salamander, Turtle, Caterpillar, Butterfly, Bee, Rat, Snake, Mouse, Shrew, Fox, Bat, Moth, Duck, Monkey, Dog, Jellyfish, Horse, Seal, Clam, Crab, Kangaroo, Seahorse, Goldfish, Wildebeest, Pterodactyl, Dragon
Generation 2: Alligator, Rat, Ferret, Owl, Ladybug, Spider, Bat, Sheep, Toad, Monkey, Platypus, Crow, Giraffe, Bat, Bulldog, Puffer Fish, Turtle, Beetle, Bear, Octopus, Fish, Manta Ray, Dog, Deer, 3 more Dogs, Cow
Generation 3: Chicken, Dog, Racoon, Worm, Butterfly, Moth, Pelican, Water Strider, Cat, Bee, Shark, Whale, Turtle, Mongoose, Snake, Seal, Walrus, Clam, Whale
Generation 4: Chimpanzee, Penguin, Beaver, Kricket, Dinosaur, Moth, Bee, Otter, Crow, Cat, Skunk, Hammerhead Shark, Hippo, Scorpion, Toad, Wasp, Bat
Generation 5: Snake, Boar, Meerkat, Dog, Leopard, Monkey, Zebra, Tadpole, Toad, Worm, Centipede, Fish, Crocodile, Hermit Crab, Tortoise, Swan, Sugar Glider, Spider, Eel, Flounder, Bear, Buffalo, Ant, Moth, Horse
Generation 6: Fox, Frog, Rabbit, Worm, Butterfly, Lion, Goat, Bear, Dog, Cat, Squid, Seahorse, Lobster, T-Rex, Brontosaurus, Bat, Deer
I have probably missed a few, but I picked out the obvious representations.
Point is though that they have already rehashed A LOT of the animals multiple times. Not to say they are bad Pokemon at all, just they really have used a lot of different animals for inspiration on Pokemon.
I’m waiting for the day we get Elephant and Rhinocerous Pokemon. (There actually are representations for both of these, derp)