BREEDING: babys need to be in the water. In my testing the babies start to take damage if they're on the land just before 25% raised (part way through the juvenile stage). You can hatch them on land you just need to transfer them into the water before that point. Thank you to everyone else that put up breeding tips about this!

To tame the Archelon you will need bio-toxin or kibble, once tamed the Archelon can eat mejoberries so you don’t have to keep killing jellyfish

If staying near the surface, which tbh most already do, you can hop on their back and passively feed biotoxin, especially helpful for higher levels

They will eat berries after taming

Breeding tip babies either need to be in a gigaraptor saddle or in the water or their health plummits very fast by 0.1 growth. Sorry for the category as I didn't know where to put this under.

TAMING: Have your mount hit the archelon you want to tame (you might do this by accident will trying to save it), it'll aggro for a long time. Kite it onto the land and clear out any threats while you wait for it to catch up. Hop off your mount and whistle passive. The archelon will slowly chase down your tame allowing you to casually feed it bio-toxin or kibble from behind while picturing the steam roller scene from the first Austin Powers movie.

Seen a few in the swallow waters around herbivore island, seems to be a common spawn point for them

Baby Archelon in ARK: Survival Ascended must be raised in water to survive and primarily eat Biotoxin to thrive. While they can consume Mejoberries once they reach the juvenile stage, Bio-Toxin is highly recommended for babies to avoid starvation. They must be submerged in water immediately after hatching to prevent suffocating on land.

To find this wonderful creature, it has a chance to spawn near the Cnidaria. So if you find the jellyfish, you just might be lucky enough to find yourself one of these bad boys. Passive tame using superior kibble or Bio Toxin. Obviously the kibble will take less time, but use what you got.

Raising Archelon needs to be done in water. Also they're bugged similarly to when snow owls came out. They eatt berries and eat more and faster then a baby giga. If you thought you could walk away, you were wrong.

DONT let their babies out of water

You can raise babies using their algae.

Tame four or more high level Archelons, cryo them for a few days then release them and level them up in food only. Put them in water and harvest the Algae until you have 40+ stacks in a fridge. You should be harvesting almost two stacks per hour (@x1) . Breed them for eggs and incubate the eggs using a gigantoraptor. Hatch the eggs and immediately drop the baby then cryo it and release underwater. Manually feed them the Algae unit the hit juvenile. Then feed them Mejoberries from troughs.

if you stand in front of its back left fin? it stops moving only for about 15 seconds but hey anything helps

The first one I saw was on Lava Island on the Center, it was a 140 and I used it to perfectly tame a high level Pyromane because it's so slow and has a high health pool.

Passive tame. They like to spawn around jellyfish, so take a bary or basilo (your best bet). On center they are in the open water near skull island/redwoods. Superior kibble is really easy to make so just use that --AK

Just like a basi tame. Clear the area and feed superior kibble. Taming on 1x bring about 25 you should be able to tame any high level. (30 just to be safe)

They spawn all over astraeos, and they usually have jellyfish near them. All you need to do is shoot the jellyfish with a crossbow and harvest. Should take a couple of them but its fine. Since the oceans in Astraeos are very shallow (with the archelon) its very easy to get silica pearls by killing trilobites. I got 200 after i killed a couple herds. So tame this thing ASAP!

Passive tame with bio toxin(jellyfish drop bio toxin and archelon are found by jellyfish)

They seem to share a spawn with Cnideria, so be aware of that. Can be useful because you can kill them for the bio toxin to feed the Archelon. I seem to see one beached everytime I go to Herbivore island.

They spawn by cnidaria (jellyfish). So if you can't find their spawn frequency map online then just find it for the jelly