[Graphics] Kabutops sprite in Pewter's Museum

Hi, I'm wondering how to modify the sprite of Kabutops' skeleton in the museum. I didn't find the solution anywhere.
Giving me the offset of the sprite would be already good for me, but maybe there is a tool that lets you edit the sprite ? NSE doesn't do that anyway.

Open Nameless Sprite Editor / NSE for short.
Load your ROM
Click Navigate :
Insert 3E0FA0 at Image and 3E17A0 at Palette.
Size for Width and Height is 8
Click Open.
Kabutops fossil will be ready to be edited.

Side note :
Aerodactyl's : 3E0780 at Image and 3E0F80 at Palette

Thanks Zhang Jiafu