I’m fine with all of these Pokémon, I’m even okay with Iron Crown despite finding a lot of the Violet Paradox Pokémon to be a bit bland design-wise.
Makes me really worried about what pre-historic creature ends up being thrown together with Entei. I'm thinking woolly mammoth with tusks replacing entei's moustache. Or a triceratops.
Almost all of the past Paradox Pokémon have some sort of dinosaurian aspects to ‘em when you think about it...
Great Tusk: Mammoth mixed with stegosaurian/ankylosaurian aspects
Flutter Mane: Its PokéDex entry in Violet explicitly mentions pterosaurs
Brute Bonnet: Ancient carnivorous plants if you gave ‘em a saurian body plan
Slither Wing: Carboniferous bugs mixed with stegosaurian aspects
Roaring Moon: This one was a tough one since it mixes base Salamence with its Mega Evolution but feathered dinosaurs comes pretty close to it
Walking Wake: Suicune with the body plan of a theropod dinosaur
The only ones that come out of left field are Scream Tail and Sandy Shocks but they still have dinosaur-inspired designs with Sandy Shocks also possibly taking some design cues from your stereotypical caveman, I also wouldn’t leave out the idea of them being based off of the kinds of articles and attention-grabbing headlines you’d see in a pseudoscientific magazine (which also ties into the games via the often-mention Occulture magazine), although the only one that I can think of is out-of-place artifacts covering Sandy Shocks.
I actually don't hate Raikou, It could've used more detail, but I like that its mane is a cloud around its head, and that it resembles a 'thunder lizard' type of dinosaur.
Funny you should mention that, the sauropod genus Brontosaurus translates to “thunder lizard” in Latin.