By TM.
Umbreon never learns Shadow Ball without a TM.
yep
sorry to burst your bubble, but ariados can't learn shadow ball.
yes
It can learn Shadow Ball.
misdreavus you can get this from Pokemon leafgreen. Or shuppet/banette can learn it and even duskull/dusclops. gastly and all evolves can to
There is no shadow ball.
Spiritomb is a Forbidden Pokemon and can learn moves such as dark pulse, shadow sneak, and ominous wind. Other moves include shadow ball, and feint attack.
level 45 in fire red leaf green
TM 30 is Shadow Ball
shadow ball isn't avalible in sapphire
Shadow Ball