Super Smash Bros Ultimate - Save Data for Nintendo Switch - No

You have to upload your save file via Nintendo Online service.

Nintendo Switch Online 12-Month Individual Membership [Digital Code] : Everything Else

Super Smash Bros. Ultimate likely won't support cloud saves on the Nintendo Switch if the game finally includes an online ranking system

How to Manage Amiibo Storage Data on the Nintendo Switch - Nintendo Switch Guide - IGN

Piranha Plant Corrupted SAVE DATA in Smash Ultimate *PATCHED*

Nintendo Switch Lite (Yellow) Bundle with Super Smash Bros. Ultimate

How to transfer save data from one Nintendo Switch system to another

Super Smash Bros. Ultimate 100% Max Nintendo Switch

Super Smash Bros Ultimate 100% Perfect Save - The Independent Video Game Community

Nintendo Switch™ - OLED Model: Super Smash Bros.™ Ultimate Bundle (Full Game Download + 3 Mo. Nintendo Switch Online Membership Included) : Video Games

Nintendo Switch data transfer – OLED, animal crossing, and other save data

How to transfer save data from one Nintendo Switch to another

Nintendo Switch Super Smash Bros Ultimate Edition Bundle

Nintendo Switch Online: Prices and Features of the Family Plan

Super Smash Bros Ultimate 100% Perfect Save - The Independent Video Game Community