Digimon Heroes sprite ripping.

[Fanciful Dancing Star]

Nobody's tried this, and I'm wondering if maybe there's a reason beyond disinterest. I'd be interested in trying it myself, but I don't really know anything about ripping assets from mobile games. I suppose I'd need to have access to the apk file? Are the sprites even stored in that, though? I notice the game has to "hatch" (i.e. download the graphics of) Digimon you haven't seen prior to a battle, so I wonder if not in the game itself, if the graphics would be stored on the mobile device's cache.

Whatever the case, I'm probably way in over my head as I've never ripped stuff from mobile games at all before, but I just couldn't help noticing that after all these years, this game's assets have never been ripped, other than some of the cards (and even those I'm not sure if they were actually ripped or if Bandai just already had their art online somewhere). Though I'm more interested in the in-battle sprites, anyway.

Does anyone have any knowledge about mobile phone asset ripping, and would this be too difficult? I'm rather clueless, I'll admit, but it doesn't hurt to ask about this.