Marowak first appeared in A Crowning Moment of Truth!, where it stole the treasured Wela Crown, an item said to boost the powers of the Pokémon wearing it, from Wela Volcano Park. Kiawe challenged Marowak to a battle with his Turtonator in order to retrieve the stolen crown, but ended up getting defeated. After having a practice battle with Ash, Kiawe returned the next day and challenged Marowak to a rematch. Using its newly learned Shell Smash, Turtonator was able to gain the power and speed necessary to defeat Marowak, finishing it off with Inferno Overdrive. After its defeat, Marowak conceded the crown and, to Kiawe's surprise, asked to join his team. Accepting Marowak's request, Kiawe then caught the Bone Keeper Pokémon.
Personality and characteristics
Marowak disappointed at its Trainer's loss
Marowak has been shown to be a brash and self-centered Pokémon, as demonstrated when it stole the Wela Crown and attacked anyone who got in its way. Marowak also seems to like dancing, even doing so in the middle of the ruckus caused by it stealing the crown and when it's happy. It was also shown to be an eager battler and to have temperament issues, repeatedly attacking Kiawe's Turtonator even after it was defeated and caught by Kiawe.
Since its capture, it seems to have developed a rivalry with Kiawe's Turtonator. This was demonstrated in Currying Favor and Flavor!, where, despite being a teammate, it kept on attacking Turtonator and even glared at it while eating its food.
Marowak will not tolerate another of its kind being nearby and will fight to the bitter end, as shown in SM042 when Kiawe and Brock tried to compare it with its regional variant.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
In the manga
Marowak in Pokémon Adventures
In the Pokémon Adventures manga
Marowak first appeared in the Sun & Moon arc. It was first used to battle Sun's Dollar at Heahea City. Dollar was initially bewildered by Marowak's ability to manipulate its flames, but Sun quickly figured out how to avoid the flames and fight back. The battle was called off after Kiawe decided to call his boss at the Thrifty Megamart and apologize for leaving work without telling anyone.