Whenever I’m in south zone 2, I tame one. Mine is a 145 named steel shell. He has helped me get so many narcoberries and carried many structures to this day. He has protected me and my dodo farm from sarcos. He has helped me build a home for splinter, my beaver. And once I start caving, I’m taking him with me to make sure I make it there safely. All I need is my raptor and I’m good to go
You can find it at a water area (I found it at the edge of the map). To knock him out, for starters, use a slingshot. When he is down bring your narcotics and berries. If he is unconscious and you fear he will wake up, punch him a few times to keep him like that. Congrats, you now have tamed a Carbonemys. Hope this helped.
Side note: if you want to be safe, through a bola and hit him with a bat to knock him out.
To get higher level "war turtles" tame 2 level 150 turtles and then breed them. Then go tame another turtle of the opposite sex to mate with the hatched turtle and do it all over again. Once you've done that you can breed the two offspring over and over to get very high level turtles. It is super easy to hatch and raise "super turtles"....lol. Good luck and enjoy