How to Evolve Cosmog in Pokémon GO — Complete Guide

Contents hide

1 The Cosmog Evolution Line

2 Step 1 — Cosmog into Cosmoem (25 Candy)

3 Step 2 — Cosmoem into Solgaleo or Lunala (100 Candy)

4 How to Farm Cosmog Candy

5 Solgaleo vs. Lunala — Which Should You Evolve First?

6 The Necrozma Fusion — Why You Will Want Both

7 How to Get More Cosmog

8 Quick Reference

9 Conclusion

10 References

Here is the trap that catches a lot of Pokémon GO players. They grind for weeks — sometimes months — walking 20km at a time just to earn a single Cosmog Candy. They finally hit 100, tap Evolve on Cosmoem, and get the wrong legendary. Not the one they wanted. Not the one the meta rewards. And because this evolution is permanent, and Cosmog is among the rarest Pokémon in the game, there is no undo button.^[1]

This guide will make sure that does not happen to you. We cover every mechanic: exact candy costs, the day/night rule that permanently determines Solgaleo versus Lunala, the fastest ways to farm candy, and a clear meta analysis of which legendary you should prioritise — including the Necrozma fusion angle that most guides miss entirely.^[1][2]

The Cosmog Evolution Line

Cosmog evolves into Cosmoem, which then splits into one of two Legendary Pokémon — Solgaleo (Psychic/Steel) or Lunala (Psychic/Ghost) — depending on the time of day when you evolve it.^[1][3]

Both Solgaleo and Lunala share identical base stats: 255 Attack, 191 Defense, 264 Stamina, and a maximum CP of 4,570.^[1] The difference between them is entirely about type and moveset, which has a dramatic effect on their usefulness in raids and PvP.

There is a third evolution path worth knowing about before you commit. Both Solgaleo and Lunala can fuse with Necrozma to become Dusk Mane Necrozma and Dawn Wings Necrozma respectively — currently the #1 Steel-type and #1 Ghost-type attackers in the game.^[2] That context changes how you should think about which legendary to get first.

Step 1 — Cosmog into Cosmoem (25 Candy)

The first evolution is the easy one. Once you have 25 Cosmog Candy, open Cosmog’s page and tap Evolve. There is no time-of-day restriction at this stage — you can do it whenever you are ready.^[3]

Cosmoem will arrive looking like a small golden orb. Manage expectations: it has a max CP of 489 and minimal battle utility. It is a stepping stone, nothing more. The real prize is what comes next.

One important mechanic to know: both evolutions draw from the same candy pool. Any Cosmog Candy you earned walking Cosmog as your buddy carries straight over when it evolves into Cosmoem.^[1][3] You do not start from zero at step two.

Step 2 — Cosmoem into Solgaleo or Lunala (100 Candy)

This is where it gets serious — and where players most often go wrong. The legendary you receive when evolving Cosmoem depends entirely on the time of day in your local time zone. This choice is permanent and cannot be undone.^[1][3]

Daytime → Solgaleo (Psychic/Steel)
Nighttime → Lunala (Psychic/Ghost)

The game determines day versus night using your device’s local clock, mirrored in the in-game map. When the map background is bright green, it is daytime. When it turns dark, it is nighttime.^[3]

Before spending 100 Candy on this one-way door, check the evolution button on Cosmoem’s page. It displays a small silhouette of whichever Pokémon you will receive if you evolve right now. Confirm that silhouette matches what you want. If it does not, close the app and wait. There is no penalty for waiting. There is no recovering from evolving at the wrong time.

How to Farm Cosmog Candy

Cosmog sits in the 20km buddy candy tier — the slowest bracket in the game, shared with other Legendary Pokémon.^[5] At that base rate, farming 125 Candy through walking alone would require 2,500km. In practice, you stack multiple methods.

Excited Buddy (most efficient): When your buddy reaches Excited mood, its candy distance is halved — Cosmog earns candy every 10km instead of every 20km. According to Niantic’s official Buddy Adventure help page, there are two ways to trigger Excited mood:^[6]

Feed a Poffin (100 PokéCoins in the shop, or earned from research): instantly activates Excited mood for six hours.^[6]
Natural excitement (free): accumulate 32 emotion points through daily buddy activities — playing with your buddy, taking a photo, visiting new places, opening buddy gifts.^[6]

Combined with Adventure Sync running in the background, the Excited buddy method is the most efficient passive candy strategy available.

Rare Candy: Works directly on Cosmog and Cosmoem. If you have a stockpile and want to close the gap fast, Rare Candy is the cleanest shortcut.

Special Research Candy: Completing Step 8 of A Cosmic Companion awards 50 Cosmog Candy directly.^[4] This is the single biggest one-time candy injection available. If you have this research incomplete, finish it before anything else.

XL Candy: If you are Trainer Level 31 or above, your buddy has a chance to find Candy XL while walking. XL Candy is required to power Solgaleo or Lunala past Level 40 — worth collecting from the start.

Solgaleo vs. Lunala — Which Should You Evolve First?

Both Pokémon have identical base stats.^[1] The gap between them in the current meta is not close.

Lunala: According to Pokémon GO Hub’s raid attacker database, Lunala is an S-Tier Ghost-type attacker, ranking #7 among all Ghost-type attackers in the game.^[7] Its best moveset — Shadow Claw, Shadow Ball, and Moonblast — gives it genuine versatility across both raids and PvP. A key advantage: Lunala resists Psychic-type moves,^[7] making it more durable than most Ghost-types in overlapping scenarios. In PvP, PvPoke ranks Lunala comfortably inside the top 10 in Master League.^[8]

Solgaleo: Despite sharing Lunala’s base stats, Pokémon GO Hub rates Solgaleo as an F-Tier Steel-type raid attacker.^[9] The problem is structural: Solgaleo has no Steel-type Fast Move available in Pokémon GO.^[9] Without a Steel fast move, it cannot output meaningful Steel-type DPS in raids. In PvP it performs reasonably in Master League, but does not match Lunala’s overall impact.

The verdict: evolve at night, get Lunala first.

The Necrozma Fusion — Why You Will Want Both

This is the section most Cosmog guides skip, and it changes the strategic picture significantly.

Both Solgaleo and Lunala can fuse with Necrozma. According to Pokémon GO Hub’s Necrozma fusion guide, the process requires 30 Necrozma Candy, 30 Cosmog Candy, and 1,000 Solar or Lunar Fusion Energy.^[2] The resulting Pokémon are in a different tier entirely:^[10]

Solgaleo + Necrozma → Dusk Mane Necrozma: currently the #1 Steel-type attacker in the game, ahead of Mega Metagross
Lunala + Necrozma → Dawn Wings Necrozma: currently the #1 Ghost-type attacker in the game, outperforming even Mega Gengar

The fusion is reversible — you can unfuse and reclaim your Solgaleo or Lunala at any time.

It is not “which one do I want?” — it is “which do I need first, and how do I eventually get both?” The answer is Lunala first for immediate value, followed by a second Cosmog for Solgaleo and Dusk Mane Necrozma. Both are worth the grind.

How to Get More Cosmog

Cosmog does not appear in the wild. Every encounter comes through Special Research.^[3] Confirmed ways to obtain one:^[4][11]

A Cosmic Companion — Free Special Research (Season of Light, 2022). Completable if you claimed it.
Starry Skies — Paid Special Research ($4.99), offered a second Cosmog for players who completed A Cosmic Companion.
GO Fest events — Cosmog has appeared as a Special Research reward at GO Fest.
Trading — Costs significant Stardust unless you are Best Friends with the trader.

Shiny Cosmog is not currently available in Pokémon GO.^[11] Watch the in-game News tab every season — when Cosmog research appears, complete it immediately.

Quick Reference

Step	Action	Requirement
1	Cosmog → Cosmoem	25 Cosmog Candy, any time of day
2a	Cosmoem → Solgaleo	100 Cosmog Candy, daytime (green map)
2b	Cosmoem → Lunala	100 Cosmog Candy, nighttime (dark map)
Tip	Fastest candy farming	Excited buddy = 10km/candy; Poffin for instant 6hr activation
Tip	One-time candy boost	Complete A Cosmic Companion Step 8 = 50 Candy
Meta	Priority evolution	Lunala first — S-Tier Ghost attacker, top 10 Master League
Endgame	Necrozma fusion	Both needed: Dusk Mane (#1 Steel) and Dawn Wings (#1 Ghost)

Conclusion

The evolution itself is straightforward once you know the mechanic — but the cost of getting it wrong is high enough that it pays to understand it fully before you spend 100 Candy. Check the silhouette. Confirm the map colour. Then tap Evolve.

Prioritise Lunala first: it is the stronger standalone Pokémon for raids right now, and the better immediate Master League asset. Then work toward a second Cosmog so Solgaleo can fuse into Dusk Mane Necrozma — one of the best Steel-type attackers in the game.^[2]

125 Cosmog Candy is a significant grind at 20km per candy. Activate Excited buddy mode, use Rare Candy wisely, and keep Adventure Sync running. Every kilometre counts.^[5][6]

Cosmog is one of many Pokémon that require specific conditions to evolve. For a full reference of every special evolution method in the game — Eevee evolutions, lure evolutions, trade evolutions, Sinnoh and Unova Stones — see the special evolution guide.

References

Michael R.

I've been playing video games for over 20 years, spanning everything from early PC titles to modern open-world games. I started Switchblade Gaming to publish the kind of accurate, well-researched guides I always wanted to find — built on primary sources, tested in-game, and kept up to date after patches. I currently focus on Minecraft and Pokémon GO.