Striders are the next evolutionary stage of Hatchling.
Getting the Strider pet
When Hatchling reaches level 55, you can complete the quest Little Wing’s Big Adventure to turn it into a Strider. But you don't have to do it at level 55 (you can wait). When you finish the quest, Hatchling becomes a Strider of the same level. For example, a level 65 Hatchling becomes a level 65 Strider.
Strider stats
If you and your Strider differ significantly in level, penalties start to apply. If the player is 5 levels above or below their Strider, the Strider's physical attack is halved. Each additional level of difference reduces P. Atk by 5%. If the player is 10 levels below the Strider, its speed is halved. Another penalty kicks in if the hunger bar drops below 50%. A starving dragon slows down by about 50%, and you'll have trouble mounting and dismounting it (mount, dismount).
On the other hand, if the Strider is the same level as you, its stats are improved: more P. Atk, M. Atk, etc.
