I know that the other bosses work in mvl as seen here https://www.youtube.com/watch?v=jh51LKAB7_Y&feature=emb_logo and here https://nsmbhd.net/thread/3670-the-official-mvsl-hacking-thread-mvsl/ and I know bowser jr works and the final boss crashes in mvl but how do you get the final boss to work in mvl

The final boss controller crashes MvsL. A workaround is to use the unused Big Bowser sprite as it doesn't require the boss controller.
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Here's my MvL Hacking thread

Consider joining the NSMB DS Hacking Discord Server!

#HakingNoMore