misdreavus you can get this from Pokemon leafgreen. Or shuppet/banette can learn it and even duskull/dusclops.
gastly and all evolves can to
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You can find TM 30 shadow ball in the last floor of MT.PYRE and in the Pokemon tower
sorry to burst your bubble, but ariados can't learn shadow ball.
It can learn Shadow Ball.
Yes all ghost type moves are physical attacks.
it is TM 30...