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Boss Activator (39, rev. 0)
Starting revision
Category 'Bosses and cutscenes', known
I am going to add theory notes for this sprite. If anyone can disprove, or prove the data or theory please do so. Eventually, maybe we can get these figured out.
-The World ID I believe is which cut scene to play.
-The Unknown 10 somehow loaded Peach and Bowser. Slight animation but they did not disappear. They were waiting for something.
-The World 1 fight has a zone. The data is all zeros, and the zone is zero. In most sprites 8-9 is where this data is stored. I tried a zone 1 setting with no luck, but again the sprite could be waiting for something else.

The option to make peach appear might be linked to 62 unused bowser
Data files: none
Sprite fields:
Input ID: value at nybble 0-1
Output ID: value at nybble 2-3
World ID?: list at nybble 11: 6=World 1,0=World 2,4=World 3,3=World 4,2=World 5,5=World 6,1=World 7,7=World 8
Unknown: value at nybble 10. I changed this to a 1 and was able to load Bowser Jr and Peach only. Still had 6 at nybble 11. Unused
Zone ID?: value at nybble 8-9. Not sure on this, but these usually have zones. This would be the right nybble if this is a setting.
Boss Activator (39, rev. 1)
By  Hiccup on 11-24-12, 02:19 pm
Category 'Bosses and cutscenes', known
I am going to add theory notes for this sprite. If anyone can disprove, or prove the data or theory please do so. Eventually, maybe we can get these figured out.
-The World ID I believe is which cut scene to play.
-The Unknown 10 somehow loaded Peach and Bowser. Slight animation but they did not disappear. They were waiting for something.
-The World 1 fight has a zone. The data is all zeros, and the zone is zero. In most sprites 8-9 is where this data is stored. I tried a zone 1 setting with no luck, but again the sprite could be waiting for something else.
Data files: none
Sprite fields:
Input ID: value at nybble 0-1
Output ID: value at nybble 2-3
World ID?: list at nybble 11: 6=World 1,0=World 2,4=World 3,3=World 4,2=World 5,5=World 6,1=World 7,7=World 8
Used by game when boss is defeated: value at nybble 10. Shows Bowser Jr and Peach
Zone ID: value at nybble 8-9