Didn't Pokemon blatantly ripoff tons of elements from Dragon Quest decades ago?
We are talking about patent law here and you are talking about copyright. According to copyright standards? Probably not.
I also find the comparison questionable. I know a lot of people are making it here. But I don't share that opinion. Many of the designs bear little resemblance, except that they are birds, for example. And the style is completely different in each case. Palworld is damn close to Pokémon. So close, my children called it Pokémon for the first few days. Because of the balls, similar characters etc. the difference is much less than the DQ / Pokémon designs. When Palworld came out back then, the visuals were a huge topic. Now many may say oh my god, they're taking them to court, why? Nintendo is evil. If we think back to the Palworld launch, the tenor was oh god, that's so similar, they'll sue for sure.
From a copyright point of view, everything may even fit. In the case of texts, sometimes only a little modification is made and it passes as an original work. But this is about patent law. It remains to be seen how the courts will decide.
By the way, I have played a few of these collectible monster games. Others manage to be a bit more unique. I found Palworld rather uninspired. They just threw survival into the mix. But even the system was nothing that hadn't already been seen elsewhere. Damn close to Ark. For me, Palworld is Ark meets Pokémon. Or an Ark in a Pokémon costume. The thing could probably have existed as an Ark mod. It's nice, but quickly forgotten.