Who has been the best Dcer ever?

[Sonic Boom]

1. they provided us the data files to modify the chars.
2. they implemented a system in which many possibilities are given
3. why would they need to make advanced dc when they have the source code to adapt the game to their liking?
(and I am sure they already did before releasing)

Yeah You're Right!!
But How Did They Make Those Data Files without that data changer as monolith mentioned?