While visiting any city you don't live in, search for any public library. Come in, and then ask the librarian "So I herd you like Mudkipz?" If he doesn't answer "I LUUUUUUV MUDKIPZ!!!1!11!", then run out of the library for your life. Don't stop anywhere, just run where your eyes lead you. If you won't run, you will see things that humankind was never meant to see. But if the librarian answers in the shown way, then he will lead you to an underground room with three Pokeballs on a table. He will point at one and say, "This one is Mudkipz." You must take that Pokeball, otherwise you will be horribly mutilated by the Mudkipz.
Mudkips in this Pokeball is Object 233 of 538. It can shoot water out from his mouth, he's cool, and can even do a thing like flying. The Pokeball is used to store Mudkipz whenever you don't need to use his powers.