Step 1: Get a decent leveled quetzal with weight and stamina.
Step 2: Get a friend to help you.
Step 3: Make a cannon and enough cannon balls to knock out whatever level you're going for.
Step 4: Place the cannon towards the back of the quetzal.
Step 5: Lead the titan behind you, following the quetzal, while your friend is shooting him in the head with cannonballs.
Step 6: Place the saddle and boom! Tamed!
You hit it with cannons on a quetzal. Go for it’s head. It’s torpor won’t drain either so take your time. They can’t eat just stuff a platform saddle on the titan once KO’ed. You use daedons to heal it when it’s food level is low.
If you try taming these guys, tame a Quetzal first and equip it with a platform saddle. Then, put 2 storage boxes on it and a cannon. Make sure you make LOTS of cannon balls. Then, shoot the titan in the head.