Dating is the best way to tame these. The appropriate dress for the occasion is a full suit of Ghille Armor. Pick your ape date up with a Quetz, drop in a taming pen, and hand-feed Mejo Berries. He/she will love you for it!
Build a small pen with a foundation a doorway and 2 walls then get him to chase you into the foundation escape through the doorway and place the last wall behind him then add 4 more walls above then a hatch frame at the top then feed him from above
Build a taming pen. Walls should be doorframes. I suggest 2x6 and two high. Put a hatch frame as the ceiling. Lie down near the whole on the hatch frame ceiling and feed him as needed. Boring, but efficient. I use my normal taming pen and just add the other walls as he walks around, to box him in on one foundation. Then, I remove the walls when done.
I've found him every time walking along the beach of the redwood biome. What was mentioned earlier works, build a stone trap. One foundation 4 door frames get him to chase you in then seal it. A random sabertooth tiger showed up during my tame attacked him and reset my timer, so beware.
1. Build a taming pen, 1 foundation 4 door frames
2. Get him in there. (Argi works well)
3. Feed him once.
4. Go do some other stuff (Food will drop now)
5. Come back and feed him crouching trough the door frame. He will not agro.
6. Enjoy your new best friend.