They're pretty bad, but to be honest, my first scratch sprite looked waaay worse and I think the ideas are good. (as mentioned earlier)
The sprite that looks best out of them is the bird, I think, as it looks "cleaner" than the others. Although you might want to work on the outlining of it, so it dosen't look so cut off at the edges. The wings for example would've looked so much better if the whole wing were outlined.
They don't seem to be completely scratch either, as the flames on the fireballs looks copy and pasted, so does the bird. Maybe you should try mixing pokemon first before you try to scratch?
Otherwise it's not anything that hasn't been mentioned by others, you need to work on your shading, and it would've been a good idea to look at some tutorials first. They could help a lot.
But that's just my opinion, sorry for the rant.