ROM Hack How I Mod Sonic Colours DS?

[Kadan98]

I'm trying to change the Wisp Capsule of one Wisp to another new (there is some new sprite on Internet) but I don't find the sprites of them on the code of the game, anyone could help me?

I downloaded CrystalTile2 and others similar but I can't find the Wisp Capsule sprite because there isn't any sprite with a similar name.

Help, please!