Before the trial

You notice up ahead is a Pokemon Center. Phew, you probably need it after the series of battles your Pokemon went through. Just before that though, Hau spots you.

"Yo," he greets you. "I hope your Pokemon are doing okay. I know my team is pretty exhausted. Anyways, I heard Verdant Cavern is kinda, like, sacred to Tapu Koko. No one can go in there except for island challengers which means only us. Oh yeah, you'll probably need this." (You obtained some Revives!)

"If your Pokemon faints in battle," he explains to you, "a Revive should get it back up. Anyways, I think I'll get a treat from the cafe before I go, I need some relaxation." And with that, he goes into the Pokemon Center. You do as well, making sure to heal your Pokemon and restock on Potions, Pokeballs, and condoms before heading on.