I'm playing Pokemon showdown with shuckle (for a challenge with my friends) and want to know if there is a move like power swap but for special attack and special defense
No, there is not.
There is Guard Swap, which switches the Defense and Sp.Defense stat changes. Speed Swap switches Speed stats.
Do you mean Power Trick? You say you are using Shuckle, Power Trick swaps the Attack stat with the Defense stat of the Pokemon using it. There is no Guard Trick or Speed Trick. Power Swap exchanges the Attack and Sp.Atk stat changes with a different Pokemon.