Advantage + a little help (Totem Gumshoos)

(If you're like me, now would be a good time to use some status effects, like paralysis or poisoning or burning + advantage to really make it a little easier. I used paralysis to get a Speed advantage and a potential for free turns, plus a Fighting Pokemon. I had to sacrifice a Pokemon here in order to get the paralysis going, I will assume best case scenario.)

With these advantages to use, Gumshoos and Yungoos goes down. (You defeated Totem Gumshoos!) Gumshoos disappears in pain, letting you take the Z-Crystal freely. (You have obtained a Normalium Z-Crystal! Trial complete!)

"Incredible!" Illima exclaims as he walks to you, "I'm amazed at your victory since I trained that Totem Pokemon to such a powerful state! Congratulations, you have cleared the trial of Illima! Oh and about that Normalium crystal, if you give it to a Pokemon that knows a Normal-type, and strike some kind of awesome pose, you unleash the Z-power of that Normal-type move."

"Anyways, before I let you go," says Illima, "let this be your first lesson in Trials. You will always encounter a strong Pokemon, like my Gumshoos. And during your wild Pokemon battles, some of them may now call on help to attempt to outnumber you, like what the Gumshoos tried to do. Now that you're finished, you are free to catch whatever Pokemon you find in Verdant Cavern. In fact, have some Great Balls!" (You obtained 10 Great Balls!). He then heals your Pokemon as well. "Anyways, when you're ready, come see me at Route 3, I wanna show you something cool."