Warudio's cry resembles "WRYYYY" The default expression for when one declares glorious victory via stopping time, throwing knives into one's opponent, and then crushing him with a steamroller which one apparently pulls out of their own anus or other bodily orifice. Of course, that one person being Dio.
This Pokémon and it's pre-evolution having the ability Regenerator is a reference to how in the JoJo universe, Vampires heal from wounds very fast.
It's ability to learn Extreme Speed and Future Sight are a referrence to "Za Warudo" (also known as "The World"), a Stand ability that stops time in JoJo's universe. Hence why Warudio is categorized as The World Pokémon.
Further more, it's ability to learn Ice Punch and Drain Punch are other Vampire abilities in the JoJo universe, as vampires are able to freeze things on contact, and drink blood by stabbing their victims with their hands.
It also has the ability to learn Steamroller, being another referrence to JoJo's universe, where Dio attacked Jotaro Kujo with a steamroller (aka "roadroller") from above.