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Overall, they are good. All I can see is that the Cubone's arm holding the bone is a little to long, and the fire is square-ish. Like I said, though, they are good.
I like these. As Jenvy already pointed out, Cubone's arm is a tad to long. That's not a hard thing to fix though. Magby looks fine with the exception of the pixelated fire, which was also already pointed out. You should try the same pose with Magby blowing fire out of its mouth. That would be interesting. XD
Nice work though. Some tweaks here and there and they would be very good.