Super Smash Bros. Ultimate has been updated to version 1.2.0 and it brings with it online connection stability in Battle Arenas, character adjustments, Pikachu/Eevee Spirits for players of Pokemon: Let’s Go, Pikachu! and/or Let’s Go, Eevee!, and more.
Announced by Nintendo Versus, in addition to the online connection stability, version 1.2.0 also contains “matchmaking improvements to further prioritize Preferred Rules in Quickplay.”
Source: IGN.com Super Smash Bros. Ultimate: Version 1.2.0 Brings Pikachu/Eevee Spirits for Pokemon Let's Go Players