Do all dragons have wing

Actually, no. It's what a lot of people think, but there are some species of dragons that don't have wings. For example, Chinese dragons don't have wings. Knuckers (a kind of dragon that's literally a serpent that supposedly lives in wells) that don't. A lot of people assume that dragons are just big lizards with wings, but there are a lot of differences.

Hydra do not have wings.

Hexapods do not have wings.

Sea serpents do not have wings.