Alright, you've done it. You've activated my character design card.
All the Scarlet Paradox forms are intentionally meant to give the Pokémon dinosaurian traits, mainly long tails and spikey jagged bits on their bodies.
Obvious examples include Great Tusk and Slither Wing:
They both take their respective inspirations (Donphan and Volcarona) and change up the body types to give them spikes and spines, sharp teeth, and more reptilian tails. Slither Wing's eponymous wings are even meant to mimic a typical dinosaur sailfin, like a Dimetrodon or a Spinosaurus.
Sometimes they have to get more creative though.
Scream Tail's long ponytail with its frayed hairs are once again supposed to mimic a spiny lizard tail. Sandy Shock's whole body is constructed like a rudimentary dinosaur-shaped thing made out of trash, it's especially obvious if you look at it from the side. It's tail is the long metal coil sticking out the back, and all those sharp magnet filings make up the spines.
Walking Wake is perhaps the most obvious example. They literally turned Suicune into a velociraptor.