Super Smash Bros. Ultimate lives up to its name with an ultimate roster consisting of every past character as well as a handful of new fighters. It's not nearly as comprehensive when it comes to game modes, but that could be changing. Nintendo recently announced that Smash Ultimate is getting a Version 3.0 update soon, but they declined to say what would be added in that update.
Thanks to the efforts of data miners, we might have our answer, or at least part of it. It was recently discovered that the file names "howtoplay_stage_builder.html" and "howtoplay_homerun.html" both exist in Smash Ultimate's code. While the data miners weren't able to find anything to further cement the existence of these modes, it seems likely that they're on the way. The upcoming big update seems like the perfect opportunity for Nintendo to re-introduce them.