I've been lurking on Smogon for a while, but I only made an account today. Ultimate Z is my favourite Other Meta, and this month was a blast.
Here are some of my favourite Ultimate Z sets. They may not be that creative, but they worked well for me:
Latios @ Firium Z/Electrium Z/Waterium Z/Groundium Z/Fightinium Z
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Psyshock
- Psych Up
- Defog
This Latios set gets surprisingly many kills. You don't press Defog that often, but it's a nice failsafe. The Z-Crystal depends on your team construction but should hit Steels for at least neutral. Z-Psych Up both fully heals Latios and wipes out the Draco Meteor special attack drops, but it could be something else like Calm Mind or Dragon Dance (as long as it wipes out debuffs).
Excadrill @ Steelium Z
Ability: Sand Force
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Sandstorm
- Stealth Rock
- Rapid Spin
- Earthquake
One thing I love about Ultimate Z is how it lets you compress team roles really well. This Excadrill sets Rocks, spins, and sets up and sweeps. Sand Force + Z-Sandstorm lets Excadrill do a pseudo-Dragon Dance, which is generally best in such an offence-filled meta. Earthquake hits enough things super-effectively and grants the bigger Z-move.
Manaphy @ Waterium Z
Ability: Hydration
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Tail Glow
- Rain Dance
- Heal Bell
- Energy Ball
This meta takes TG + RD Manaphy to the next level. The tyke's Tapu Koko-weak, but eliminate that electric fey and this is one of the best sweepers in the meta, IMO. Boosts faster than a bunch of tanks can Z-Stockpile, has Z-Rain Dance to outpace a lot of opponents and boost its Water STAB, and can full heal with Z-Heal Bell if the opponent is passive enough. The base attack is Energy Ball to hit all Water Absorbers for at least neutral, though it could be something else.
Tapu Koko @ Fairium Z
Ability: Electric Surge
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Wild Charge
- Brave Bird
- U-turn
- Hyper Beam
This is based on other Tapu Koko lists I've seen in this thread--I just like this version the best. Electrium Z Koko can break some walls in two, but it's blocked soooo hard by Ground-types, so I like Fairium Z Koko a lot more. Brave Bird provides a 190-BP Z-move and will hit a Grass-type super-effectively some day. Hyper Beam is here so Koko can go mixed and often OHKO Kartana:
4 SpA Tapu Koko Twinkle Tackle (200 BP) vs. 0 HP / 0 SpD Kartana: 249-293 (96.1 - 113.1%) -- 75% chance to OHKO
Koko's got no time to set up, anyway.
Tapu Koko @ Firium Z
Ability: Electric Surge
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Wild Charge
- U-turn
- Giga Impact
- Dazzling Gleam
This is my favourite lure set for Koko. The goal with Firium Z is to lure Excadrill and Steelix and deal heavy, heavy damage to them. I'm using Giga Impact instead of Brave Bird because Fire hits Grasses super-effectively, and 10 more BP on the Z-move helps. Dazzling Gleam is here to hit Dragons super-effectively and hit Steelix on its weak special side.
I'm making an Ultimate Z RMT to raise awareness for this fun meta. It's for my most successful (but still likely flawed) team, which uses different sets from these.