rendering to texture and rendering images with alpha

Is there a way to render to texture with GX?

And how do i render images with alpha channel i know it s an example included in devkitPro called "gxSprites" witch does this
but it is extremely badly commented so i don't get much out of it.

Uhm, it is rendered to a framebuffer, you don't have to show the framebuffer on the screen, you could just save it for use later.