Assuming you're on Windows, buying a MayFlash DolphinBar and a genuine Wii Remote Plus + Nunchuk is enough for probably any Wii game you may want to run in Dolphin (Skyward Sword included). You can refer to our recommended accessories guide for some direct Amazon links of products that are guaranteed to work fine with Dolphin (also, if you buy through those links you're actually helping Dolphin)...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)