Just one problem. There aren’t any abilities in Pokémon Legends Arceus, so abilities don’t actually matter, also when it comes to speed, usually in a play through, I found that strong and agile style moves made up for it when playing through. As long as it could hit hard, it could take down Pokémon pretty easily.
Also, consider when you get access to the Pokémon next time you do a play through answer, though both Empoleon and and Walrein and their evolutionary lines can be found in the Cobalt Coastlands, with their fully evolved forms usually an Alpha Pokémon. Additionally, you should think about other alternatives to each Pokémon. Empoleon might be a good water type, but am you missing out on better steel types? Same with Walrein. Sorry for the wall of text.