Cobalt is Tagg's Metagross and the final member to join his main Hoenn team, having been a gift from Steven Stone to Tagg for beating him. He became a Metang and later Metagross by fusing with other members of his species, forcing Tagg to stay in a cave for a month while he got used to his new body.
Cobalt is extremely logical, powerful, and very good with kids, surprisingly for a species with a fair amount of innate aggression. As the greatest mastermind in Tagg's team, he serves as the overall brains of the outfit, making and executing plans with a high degree of precision.
- Age: 12
- Met: Mossdeep City, Hoenn [Gift From Steven Stone] (Beldum)
- Ability: Clear Body
- Ball: Poké
Cobalt is both extremely strong and extremely smart with years of experience, and this shows in combat, with Cobalt being considered one of Tagg's heavy hitters. He can use Agility to increase his speed and hit like a mack truck, and is capable of crushing someone with a focused Gravity. He can also calculate with precision to have his moves make the maximum amount of damage.
- Magnet Rise
- Hammer Arm
- Grass Knot
- Ice Punch
- Protect, Round, Take Down
- Agility, Gravity, Miracle Eye, Psychic, Zen Headbutt
- Iron Head, Meteor Mash
- Cobalt actually gets along quite well with Xatu.
- Cobalt sprouted off Steven's Metagross, who also taught him everything he knew about the Alakagross Civilization in order to prevent its mistakes.
- Helped Tagg win the Mt. Battle challenge.
- Demolished a bunch of poachers attacking Tagg, Tracer, and Silent in Hoenn.
- Found Neptune through finding his Houndoom in the Dream World, a process that took a very long time.
- Achieved Mega Evolution.
- Cobalt was the first Beldum Line member to appear in the RP.
- Cobalt is the only mon belonging to Tagg that he has ever struck, due to his and Xatu's tampering with his memories.