No need to knock out as it is a passive tame. Berries is best if a player does not have Rare Flowers. Easy tame, however, annoying because it will continue to walk around. Trapping it in a small area would best make it an easier tame and less wandering.
Once tamed, petting the Lystro will give experience boost to any dinos as well as players that are in its radius. I believe it lasts 5 minutes. So, when crafting a bunch of items, pet these little dogs.
Be warned! If you want a puppy like this little guy to pet and look cute, he’s the best! However!! If you leave it outside (even in a pen) they will get picked up and carried off without you even realizing it. You will be sad. So bring your pets inside! Lol
This dinosoar is a relativey easy game for even early level players since it is a passive tame, won't attack you, and only needs berries. So to conclude, mejoberries are good to have. That is pretty much all you need. Also, once tamed out of next to other dinosoars in you have any because when you let it it will gov a small XP boost to nearby dinosoars.
One of the easiest tames and one of the most intelligent it inspires others for an xp boost so always have one with others and takes at least 10 berries to tame place berries in last slot and you can hand feed it!