I dont get the idea your talking about, it sounds like the battle system is iso which it's not
anyway the diglett is alright, but the things that are wrong with is you used actual black on it...never use actual black on a sprite(or this style in this case), and there isnt a dark outline around it either, but that can be fixed easily, thnx for it, but please, tell me what your making next time before you make it(i already have a magnemite from a while back, so all i have to do is edit it), and the intro im still thinkin about, but i dont need any help with it at the moment, nor the battle system.
btw im making a tutorial soon on how to make people/NPC's in the game's style since most people are having trouble doin this. so it will be easier for people