Pokémon Ultra Sun and Ultra Moon - Captain Mina's Trial for Fairium Z, Poni Grand Trial with Kahuna Hapu for Groundium Z

Captain Mina's Trial for Fairium Z and the Poni Island Grand Trial with Kahuna Hapu for Groundium Z are the finally obstacles you'll face in your Island Challenge, before the big showdown with the Elite Four.

Here on this page we'll explain all you need to know about the story and main events as they unfold here, and as with all pages of our walkthrough we'll highlight any and all trainers, items and wild Pokémon available to catch as well.

For more general guides and other walkthrough pages like this meanwhile, head back to our main Pokémon Ultra Sun and Ultra Moon walkthrough and guide hub.

Pokémon Ultra Sun and Ultra Moon Captain Mina's Trial for Fairium Z

Captain Mina can be found at her home back in Seafolk Village. Your first task is a battle against her team of three Fairy-type Pokémon, which have a few shared weaknesses - two are weak to Fire, two to Poison, and two to Steel - so rotate your team accordingly.

After that, you need to go and collect a series of coloured Petals by defeating the other Trial Captains around the map! Here's where to find each, in order:

1. Captain Ilima - Hau'oli Cemetary. Fighting-type attacks are useful against all three.
2. Captain Mallow - (Ultra Sun) Lush Jungle. Fire, Ice, and Flying are all super effective against all three.
3. Captain Lana - (Ultra Moon) lush Jungle. Grass, Rock, and Electric are all super effective against two of her three Pokémon, so rotate accordingly.
4. Captain Kiawe - Wela Volcano Park. Water and Rock are super effective against all three, as they are against Hiker David's Pokémon, too!
5. Captain Sophocles - Hokulani Observatory. Ground is 4x effective against all three Pokémon and fire super effective too.

After defeating all of them, zip back to Mina's place in Seafolk Village for a final battle of the Trial - against Totem Ribombee!

It summons either Blissey or Pelipper, but there aren't any shared weaknesses besides Rock-type between two of the three. Focus down Ribombee first - and beware it's a fast one! - and then deal with its easier allies.

After that, you'll finally have completed your last trial, and be awarded Fairium Z. Just the Grand Trial to go!

For more on Pokémon Ultra Sun and Moon, head to our main Pokémon Ultra Sun and Ultra Moon walkthrough and guide hub, which includes guides to new Ultra Sun and Ultra Moon Pokémon and Pokédex changes, the Festival Plaza, a list of Global Missions and rewards, an explainer on Pokémon Bank, a dedicated page on Pokémon Competitive Training, including IV Training, EVs and hidden stats, Breeding 6IV Pokémon explained and how to farm Bottle Caps fast for Hyper Training. What's more, we have pages on the Rockruff event for getting Dusk Form Lycanroc and, last but not least, a full Ultra Sun and Ultra Moon QR codes list for adding all Pokémon to your Pokédex.

Pokémon Ultra Sun and Ultra Moon Kahuna Hapu's Poni Island Grand Trial for Groundium Z

Alright! Time for that showdown with Kahuna Hapu which, let's be honest, has been coming for a while. After defeating the Totem Ribombee you'll be told to find Hapu over on Exeggutor Island.

She specialises in Ground-type Pokémon, but the inclusion of Flygon throws a bit of a spanner in the works. Three of her four Pokémon are weak to Water and Grass, and three to Ice, so hopefully you should be able to rotate - plus, having just completed trials against Dragon types anyway, Flygon shouldn't be much of an issue!

Next up: Ultra Sun and Ultra Moon - Mount Lanakila, catch Necrozma, and Icium Z

When she's defeated, you'll be rewarded with Groundium Z. Even more importantly though, you've just completed the main part of your Island Challenge! There's one last hurdle in your way before you become Champion of Alola, then: the ascent through Mount Lanakila and the ensuing battle with the Elite Four.