Multiple questions. I would like to know for a hackgame I want to do.

For my 1st idea I know I would possibly have to replace like I seen done like replacing Lore magic. I would rather keep Lore magic though. I know this might be possible with EXTENDED ROM. I read you can do it with a program. But some things have to be done manual? Is there a way to get a patch or something for a finished EXTENDED ROM? So that I may be able to add a new List?

As for the 2nd thing. I know it will need manual hack at one point. I read the first time they show is the time it sets there palette's and sprites. So maybe after Terra changes into Esper there be a time I can set her default stuff. Maybe during Zozo.