From Bulbapedia, the community-driven Pokémon encyclopedia.
Ash's friends are the traveling companions that Ash Ketchum has had with him on his journey on his quest to become a Pokémon master. While he started his journey alone, many people have joined his party while touring the Pokémon world; usually at least one new companion joins—and another leaves—every time a new region is visited. Johto is the only region where Ash did not acquire a new friend that would travel with him.
- Main article: Misty
Misty joined Ash in Pokémon Emergency!, traveling with him because she wanted him to replace her bike, which was destroyed by his Pikachu. She would continuously travel with him until Gotta Catch Ya Later!, when she returned to Cerulean City nearly full-time to lead her family's gym, though she briefly traveled to Hoenn and met up with Ash's Advanced Generation group, and again to "escort" her back home.
- Main article: Brock
Brock first joined Ash in Showdown in Pewter City after Ash battled him in the Pewter City Gym. After his father Flint offered to take over the duties of Gym Leader, Brock followed Ash through Kanto, leaving briefly from Poké Ball Peril to A Tent Situation to work for Professor Ivy. After this episode, Brock returned to be with Ash and Misty until Gotta Catch Ya Later!, though he, unlike Misty, would return shortly, in You Can Never Taillow, sticking with Ash until the end of the series. He would again return in Two Degrees of Separation!, and so traveled through Sinnoh with Ash until Memories are Pearls! Friendship is a Diamond!!. Of all of Ash's friends, Brock is his closest friend and treats him like a brother.
- Main article: Tracey Sketchit
After Brock left, Ash's traveling group was again down to two, as it had been for the first five episodes of Kanto. However, this would not last very long, as in The Lost Lapras, Tracey essentially invited himself along for the rest of the Orange Islands saga. Traveling with Ash, he wished to attain his ultimate goal of meeting Professor Oak, which he did when Ash returned to Kanto in A Tents Situation. After this, he remained in Pallet Town to be Professor Oak's assistant.
- Main article: May
Ash may have traveled to Hoenn alone; however, shortly after his arrival, he met May, a young girl who desired to travel around the world and a fellow Trainer who was just starting her journey. Though she initially did not care for Pokémon battles, she eventually found Pokémon Contests, in which she competed in both Hoenn and Kanto. May traveled with Ash through the entire Advanced Generation saga, from Get the Show on the Road to Home is Where the Start Is. She, like Misty, reappeared briefly during the Diamond & Pearl series to compete in the Wallace Cup.
- Main article: Max
Max is May's younger brother. He did not have any Pokémon of his own because he was too young, but he often befriended certain Pokémon. He traveled with the group from There's no Place Like Hoenn until Home is Where the Start Is, when he went home to Petalburg City. However, he made a promise to Ash that as soon as he got his own Pokémon, he would battle Ash.
- Main article: Dawn
Like his journey into Hoenn, Ash ventured to Sinnoh alone, where, in When Pokémon Worlds Collide!, he would meet Dawn. From that point, after saving Ash's Pikachu and having her bike fried in a similar way to May's and Misty's, Dawn would travel with Ash and Brock through Sinnoh, which she did until Memories are Pearls! Friendship is a Diamond!!.
- Main article: Iris
Like his journey into Hoenn and Sinnoh, Ash ventured to Isshu alone. It seems that he will meet Iris (Probably in BW001) as his female friend from the region.
- Main article: Dento
Dento seems to be the replacing Brock in the Best Wishes series, because of his status of Pokémon Sommelier.
Dento's Pokémon are not announced yet.