TM30 Shadow Ball: Prize for beating the Ecruteak City Gym Leader. Can also trade BP in for it at the Battle Frontier.
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You can obtain the TM Shadow Ball when you defeat Morty in Ecruteak.
It can learn Shadow Ball.
It is found in Ecruteak City Gym
shadow ball has 15 pp
Pretty much any psychic Pokemon but I suggest Gardevior, Espeon, Alakazam, and Xatu. Movesets Gardevior Psychic Protect Shadow Ball Calm Mind Espeon Psychic Shadow Ball Trump Card Protect To Lazy to Do the rest check SMOGON