Gaia is highly curious in nature. If Muddy can be described as Tagg's number two, then Gaia is the team's mother figure, including towards Tagg himself. While fairly patient she can at times get exasperated at the other's antics.
- Age: 6
- Met: Sandgem Town, Sinnoh (Turtwig) [Gift from Professor Rowan]
- Ability: Overgrow
- Ball: Poké
Gaia's battle style can be described as being similar to Nudi's, except that she's more physically based. Since she can't dodge very quickly, Protect is an often used move in her repertoire. Gaia can also crush opponents under her weight, or bite down with her powerful jaws.
- Sunny Day
- Bite, Crunch
- Frenzy Plant, Giga Drain, Seed Bomb
- Attract, Protect, Round, Tackle
- Gaia, like all of Tagg's mons, dislikes Sonny.
- Helped Tagg win the Sinnoh League.
- Helped defeat Missingno.
- Gaia gets her name from the Titan of Greek mythology.