Marowak was shown to be troublesome since it caused some chaos to other Pokémon at the festival. After getting defeated by Kiawe, nonetheless, its problematic side has begun to converge as it has started to respect his skills as a battler, which is one of the reasons it chose him to be its trainer with the other reason being it can learn a lot from him. Still, it doesn't trust Turtonator much owing to the experience of being defeated by Turtonator as well as its bellicose personality and always wants to fight with Turtonator due to seeing it as a rival.
It loves to dance around with its bone, especially when it's thrilled.
In SM042, Marowak is shown to have a short rivalry with a fellow Marowak from the Kanto region only to be restrained by both Brock and Kiawe. It also has a mischievous side by attacking towards the wild Onix's head using its Bonemerang when Brock tries to calm it down.
Marowak, as a wild Pokémon, first appeared in the crowning ceremony and stole the crown that Olivia was going to crown Litten with its bone before causing more havoc and running away. With the help of three hikers, Kiawe managed to find Marowak, who was practicing its dance, and challenged it with a battle. However, thanks to the crown it had stolen, Marowak was able to dodge Turtonator's attacks as well as Turtonator's Z-Move, and defeated Turtonator, which caused Turtonator to have severe injuries. After Turtonator was recovered and had a practice match with Pikachu the day before, Kiawe challenged Marowak, who wounded the hikers' Magmar, to a rematch which it got defeated this time. Impressed by Kiawe's skills, Marowak asked if it could come with him after it returned the crown. Kiawe accepted its offer and caught it thus adding it to his team, though it still wanted to continue fighting with Turtonator and got stuck at Tutornator's belly-hole until Kiawe helped it to get out. Then it got crowned in the ceremony and was ready for a photo with its new trainer, Turtonator and its trainer's friends with their Pokémon which the hikers' appeared in a few of the photos jumping in somewhere in them.
Marowak and Turtonator were seen arguing and later they began to fight that Marowak got its head stuck in Turtonator's belly-hole and Kiawe must recalled them back into their Poké Balls. It was then seen eating its food with he other Pokémon while glaring at Turtonator.
|Flame Wheel||A Crowning Moment of Truth!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
Marowak is the second Alolan Form Pokémon to be owned by one of the main characters. The first is Snowy.