Ripping Questions

[sgn15]

hi, i am new here. i just saw this thing called "mobile jack" and i want to ask if there is an emulator for this console (im not sure)

i want to play these games and rip sprites from some games of this kind.

here is an example game for mobile jack (the link has no download link, its just a description but in japanese language so i think its ok to post it)
http://www.bandainamcogames.co.jp/mobile...&carrier=2

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another 2 questions:
1. for GBA, is there a way to hack the rom itself cuz i tried using the animget method but my problem is the char that i want to rip is too big and some parts of its head cant be seen in the screen.
like this:


Game: Shaman King: Master of Spirits 2
Chars im trying to rip: Spirit of Fire and Zeke Asakura

2. for DS, is there also a way to change the default background color after i turn off the layers aside from black? and i used desmume but the char sprites and the lifebars are in the same layer. i might as well would like to hack this rom to get the sprites but how do i hack it? this picture below when i change the black color the sandals of natsu is also black so its gone when i change the black to something else. help please.
screenshot:


Game: TV Anime - Fairy Tail Gekitou! Madoushi Kessen
Sprites im trying to rip: All sprites (chars and backgrounds)