In the games
The stat Trainers first appeared in Pokémon Diamond and Pearl, where each is encountered at a certain point during the player's journey. Unlike other Trainers, the stat Trainers ask the player to help them to navigate their way through a certain area, participating in double battles against other Trainers and wild Pokémon, and healing the player's Pokémon after each battle.
After the player has defeated the Elite Four, the stat Trainers that the player has so far encountered (only Cheryl is required to be encountered during the game's storyline; the others are optional) will be waiting in the Battle Tower to participate in tag-team double battles.
In Pokémon Platinum, in addition to reprising their role from Diamond and Pearl, the stat Trainers the player has encountered will also appear in the Battleground in the Survival Area as potential opponents. Riley and Buck are also now required to complete the game's storyline, with both of their scenarios involving Team Galactic.
The stat trainers also appear in Pokémon HeartGold and SoulSilver as tag-team partners in the Battle Tower.
In the anime
So far, all of the five have appeared in the anime, doing so in the same order they can first be encountered in the games.
Cheryl was the first to appear, in Some Enchanted Sweetening and the two episodes that followed. As in the games, she traveled with Ash and his friends through Eterna Forest. After finding the honey she was looking for in An Angry Combee-nation!, she left the group.
The next to appear was Mira, in Sandshrew's Locker!. Unlike in the games, she was not lost in Wayward Cave, but instead needed Ash and his friends to help her with their Template:Type2 Pokémon to retrieve her Sandshrew from her sunken school. After this was done, she had her Abra teleport the group to Hearthome City.
Riley made his appearance more than 50 episodes later, when Ash journeyed to Iron Island in Steeling Peace of Mind!, after facing Byron. Like Ash, Riley has the ability to use Aura. He and his Lucario, along with Ash and his friends, stop Team Galactic's plot to discover the location of Spear Pillar on Mt. Coronet while attempting to calm the Template:Type2s that are disturbed by the beam the evil team is sending at the mountain in the next episode.
Marley appeared in Keeping in Top Forme!, when she was helping a Shaymin get to a field of Gracideas. Team Rocket were especially after Shaymin, which she and her Arcanine were able to escape from, while saving Shaymin insider her basket. Marley had asked Brock, along with Ash and Dawn, to escort her to the garden to find the field of Gracidea flowers for Shaymin.
- All of the Pokémon used by the stat Trainers when they team up with the player are Pokémon that, as of Generation IV, have evolved once.
- All the stat Trainers' names are based on a variety of grains, in the original Japanese and all translated versions.
- The stat Trainers are the only Pokémon Trainers with animated sprites that use the standard Trainer battle music.
- There is no stat Trainer that specializes in only Special Defense.
- The stat Trainers are the only Trainers allowed into the Battleground without being Gym Leaders.
Professor Rowan • Professor Oak • Johanna • Barry • Lucas • Dawn • Cynthia • Looker • Stat Trainers (Cheryl • Riley • Mira • Buck • Marley)
Bebe • Teala • Felicity • Roseanne • Eldritch • Wilma • Jasmine • Julia • Pokémon Fan Club Chairman • Dr. Footstep • Mr. Goods • Mr. Fuego
Massage Girl • Scarf Guy • Ketch Appy • Team Galactic • Gym guide • Gym Leaders • Elite Four • Frontier Brains • Name Rater • Stats judge
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