It is a Game Corner prize. It is the TM30 worth 4,500 coins. Just talk to the lady on the far right in the Game Corner Prize building.
Chat with our AI personalities
TM 30 is Shadow Ball
You can find TM 30 shadow ball in the last floor of MT.PYRE and in the Pokemon tower
You can obtain the TM Shadow Ball when you defeat Morty in Ecruteak.
That TM is not in firered.
The TM shadow ball can only be purchased with your game corner coins at the game corner exchange in celadon city there are TM's being sold in the exchange on the far right counter.