The Sun's Capsule

The Sun's Capsule is an ancient item created by the Sunwalkers in order to come to the Earth and survive without their need to weaken without having any exposure to the sun. Another effect it had was to make give any Smurf the ability to become a Sunwalker. However, they must be related in some way in order for it to actually work.

Smurf Me Up
Papa Smurf had the capsule in his possession for a very long time and only shows it Glovey when he learns about his enchanted form which surprises him as he believes Glovey to be a decendant of the ancient tribe. He gives the capsule to Glovey so that he may learn something about the tribe as he gets transported to the sun by the capsule's magic where he meets strange looking Smurfs who appear a bit more advanced then their blue counterparts.

Once In A Blood Moon
Glovey uses the sun capsule in his final fight with Dracula to become human size and to borrow energy from the sun to finish he COunt once and for all.