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

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.

with further testing you can also get a ai bug out by sitting on both left and right rear fins only for 15 seconds so not worth much

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 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.

DONT let their babies out of water

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

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.