Q&A for How to Get Cosmog in Pokémon Sun and Moon

You should follow the same steps. Travel to the reversed world, go to the Lake of the Sun/Moon, and trigger the cutscene.

Go to the Altar of the Sunne at night for Pokemon Sun. Go to the Altar of the Moone during the day for Moon.

For Pokémon Moon, the portal to find Cosmog appears when it is night in real life and day in your game.

No, Solgaleo/Lunala will stay the same.

No. You can only get one Cosmog per save file. Beating the Champion/Elite 4 only causes the Tapus to respawn if they fainted.

You will find the Lake of the Sun (or Lake of the Moon) northeast of Ula'Ula Meadow, beyond some tall grass.

The Lake of the Moone is on Ula'ula Island. From the north end of Ula'ula Meadow, turn right instead of continuing north to Route 17; after a brief walk through the grass, you will arrive at the lake. Note that in the regular game world, this exact location is known as the Altar of the Sunne.

You only get Lunala from Cosmog if you are playing Pokemon: Moon. If you are playing Pokemon: Sun, you get Solgaleo.

Unless you have a friend who can trade one to you, no.

Cosmog evolves into Cosmoem at level 43 and Solgaleo (Sun) or Lunala (Moon) at level 53.

To open the rift in Pokémon Moon, go to the Altar of the Moone when it is night in real life and daytime in your game. There, you can cross into the reverse world. Once across, travel to the Lake of the Sunne in that world to find Cosmog.

In this case, Cosmog still evolves into Lunala. Cosmog only evolves into Solgaleo in Pokemon Sun.

You can only get a Cosmog once in a save file. You can get more by trading, of course, but you can only get one on your own.

When you catch Cosmog, it will only know Splash. If you level it up to level 23, it will learn Teleport.

It depends on your goals. In my opinion, trading is advisable, as it is typically the only way to acquire the other game's box legendary.

You need to return to the Altar of the Sunne/Moone in Poni Canyon at the correct in-game time (day for Pokémon Sun, night for Pokémon Moon). Your Solgaleo will open a rift to an alternate dimension. Travel to the Lake of the Sunne/Moone on Ula'ula Island. There, your Solgaleo will interact with a newly appearing Lunala, and you will receive a Level 5 Cosmog.

If the rift is present, you should go through it. If it is not, check your 3DS system settings, as your console's internal clock might be set incorrectly.

Yes, you can, if you are playing Pokemon Moon. The first is when you get it from Lillie, and the second one is when you evolve Cosmoem.

Even though it might be night in real life, it might not be night in the Nintendo 3DS. You can try tweaking the time in the system.

No. In Pokémon Sun and Ultra Sun, Cosmoem will always evolve into another Solgaleo. To get both Solgaleo and Lunala, you must trade for the legendary Pokémon from the opposite game version.

You need to have Solgaleo, Lunala, or their Necrozma fusions (Dusk Mane/Dawn Wings) in your party for the cutscene to trigger at the Altar. Without one of these, you won't be able to approach the center. Also, confirm you haven't already collected Cosmog, as you can only obtain it once per game.

To obtain Cosmog, you must have either Solgaleo or Lunala, or Dusk Mane/Dawn Wings Necrozma, in your party. Without one of these Pokémon, the event will not trigger.

You would have to change your system clock as the game determines the time of day/night based in that. Be careful though, as changing your clock will temporarily suspend time based in-game events such as the stocks in the Festival Plaza shops (this also affects any games downloaded to your system simultaneously, and you will need to open each of them individually in order to reset the suspension).

Firstly, you have to be playing Ultra Sun or Ultra Moon. Second you need to have Solgaleo, Lunala, or Dusk Mane/Dawn Wings Necrozma in your party. After that, just go up to the rift where you would normally initiate an Ultra Warp Ride, and select "Go to the reverse world". Something to point out is that you can only visit the reverse world at night in Ultra Sun, and only during the day in Ultra Moon.

You have to go to Lake of the Moone in the reverse world, with Solgaleo in your party (must be Solgaleo, Lunala and/or Necrozma will do nothing). For Ultra Moon, it would be the Lake of the Sunne in the reverse world with Lunala in your party.