In its debut appearance as a Turtwig, it is shown to be nice, kind and a street-smart Pokémon who shares other Pokémon's food and giving them some fruits. It is also shown to be overprotective to fellow Pokémon when it protects Pikachu from Ash. This is similar to Ash's Bulbasaur and Brock's Mudkip. Torterra is also shown to settle feuds with angry Pokemon. When it likes the trainer such as Ash and Clara, it is seen to bite their heads in affection much like James' Carnivine when it bites his head.
In The Champ Twins!, Torterra had a initial argument with Dawn's Piplup when Ash and Dawn are arguing at each other during their tag battle against The Champ Twins which resulted in their first loss. Both continues to argue until Pikachu breaks up by hitting them with a Thunderbolt. Both of them later teams up to fight Team Rocket's Pokemon and finally against The Champ Twins and the two became friends after both Ash and Dawn win.
Torterra was first caught as a Turtwig after battling Ash and his Pikachu. In its debut appearance, it manages to save Pikachu from Team Rocket and also shows its overprotective nature when protecting Pikachu from Ash. Turtwig is also friends with an old lady named Clara and its affection is to bite someone's head like Ash while showing affection to Clars she blocks it with just a long twig. After Team Rocket is blasted off, Turtwig decides to challenge Ash using Pikachu to fight but was defeated and allows Ash to capture it. Clara tells Ash to take good care of Turtwig. Turtwig is also used by Ash while fighting against Paul's Chimchar. It also displays its intellectual skills to fight an opponent until it was being defeated it. Paul shows his cruel side to Ash when he defeats him in battle even his mistreatment to his Pokémon.
In The Green Menagerie!, Turtwig battles Gardenia's Turtwig after it loses the battle against her in their first bout upon meeting. Both are equally matched even it got a disadvantage when it was hit from its Leech Seed. Turtwig eventually heals itself from its Synthesis as both of them charge head on using Tackle. Turtwig manages to defeat Gardenia's. Therefore, Turtwig was easily defeated by Gardenia's Rosarade in one hit using Weather Ball causing Ash to use Aipom as his final Pokémon to fight until it defeats it.
While battling Paul's Honchkrow in Aiding the Enemy!, Turtwig evolved into Grotle, but lost due to its lowered Speed. But after learning how to cope with its defense from Paul's Torterra when it fought Gliscor, Ash managed to make Grotle stronger and Grotle learned Rock Climb. Since evolution, Grotle managed to defeat foes like Candice's Sneasel.
With its new size and strengths, Torterra now knows more powerful moves such as Leaf Storm in addition to the moves Energy Ball, Rock Climb and Synthesis. Despite its size and power, it has no problems battling Team Rocket, but it has been defeated in several battles against Pokémon it should have an advantage over: Volkner's Electivire, Bertha's Hippowdon and Paul's Drapion, though most likely because not only did they have moves that Torterra was vulnerable against, but they also had better maneuverability over it and it's massive size made it an easy target. Also even when it lost, it managed to at least put up a close fight.
Ash decided to leave Torterra at Professor Oak's Lab when he made a fresh start for Unova. It currently resides at Professor Oak's Lab.
|Tackle||Gettin' Twiggy With It!|
|Razor Leaf||Gettin' Twiggy With It!|
|Bite||Gettin' Twiggy With It!|
|Synthesis +||Gettin' Twiggy With It!|
|Energy Ball +||Team Shocker!|
|Rock Climb +||The Lonely Snover!|
|Leaf Storm +||The Fleeing Tower of Sunyshore!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
- When it was a Turtwig, Torterra has a way of showing affection by biting on someone's head.
- Torterra is the only Pokémon in Ash's Sinnoh team that has never defeated any of Paul's Pokémon.
- Throughout its evolution, Torterra has relied on specific stats to battle.
- As a Turtwig, Torterra relied on speed, accuracy, and evasiveness.
- As a Grotle, Torterra relied on defense, patience, and precise attacks.
- As a Torterra, Torterra relied on attack power, strength, and healing.
- After evolving from Grotle to Torterra, it was the first time Ash had two fully-evolved starter Pokémon from the same region.
- Torterra is the second fully-evolved Sceptile is the first. -Type Starter Pokémon Ash owns;
- Torterra is Ash's first Pokémon to learn a Hidden Move, Rock Climb.