Using the Competitive Playable Bosses mod we can play in any game mode and in this one, I showcase Dharkon facing against his Classic Mode route, even battling Galeem!
There are audio issues thanks to Windows Clipchamp, that's the last time I use that for video editing.
This mod falls under fair use as the purpose of its creation is and was for educational purposes and its source code is available to the public on GitHub.
Playable Bosses Mod:
GamaBanana: https://gamebanana.com/mods/457095
Source Code: https://github.com/NemesisSSBU/Playable_Bosses