Sprigatito are an adorable pokemon who are far more popular than their evolved forms, and many a trainer, in lieu of using an everstone, have taken to imploring their pet Sprigatito not to stand up – i.e. to not evolve into Floragato. It is all the more unfortunate that, had humans with pokeballs been around in the Pleistocene, they likely would have had their wish.
The fossil record shows ample evidence of two large, quadrupedal pokemon with an obvious resemblance to Sprigatito. Sprigatooth was a fearsome predatory feline with fangs reminiscent of Raikou's, but longer and made of bamboo; in Sprigriffin's case, Sprigatito's leafy collar seems to have grown into a pair of long, thin wings. We can not, of course, be certain of the evolutionary lines of extinct pokemon, and paleontologists still dispute whether Sprigriffin and Sprigatooth evolved from one another, or represented separate paths of evolution, a la Eevee today; Floragato fossils are also known from this period.
Paldea's heat and humidity, which prevents hail from forming in the region, also breaks down fossil DNA, and local paleontologists have not managed the mighty feats of resurrection of many of their counterparts elsewhere; even their names must be regarded as tentative reconstructions. Neither is mentioned in the Scarlet Book, for they were surely extinct at the time of its composition – a victim of the ice age's end, perhaps, or of failing to out-compete humans for prey, for armed with stone tools, they surely could not have taken either creature down.
Domestic Sprigatito survive in vast numbers, so it is possible in principle to figure out how two of its evolutions became extinct long before domestication. But the genes required are likely lost, and every command today to "not stand up" must sadly be understood as a request to avoid evolution.