From SmashWiki, the Super Smash Bros. wiki
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The Shop is a feature in Super Smash Bros. Ultimate. It is functionally similar to the Trophy Shop from Super Smash Bros. 4, though instead of trophies (as they are absent from the game), the player is able to buy a wide variety of in-game collectibles with the Gold they've earned via numerous methods - including several items that cannot be unlocked in any other way.
The player can access the shop from the bottom-right corner of the Vault. At first, not all the slots will be full, and Gold will need to be spent in the Shop in order to unlock the slots.