First destroy the shooting guns located on the side of the wall. After you destroy the shooting guns there is electricity left behind. When Draygon shoots out that white, gooy, gunk, stand next to the electricity on the side wall. Then let that white, gooy, gunk, touch
you. Draygon will pick you up and when he does, use the Grappling Hook on the electicity. He'll be fried to a crisp but you'll suffer some damage to.
Note: You'll suffer a lot of damage so carry a sufficient amount of energy units and plenty of energy tanks.