Joseph Stone, known in the games as Mr. Stone, runs the Devon Corporation from Rustboro City and is Steven Stone's father. In Ruby, Sapphire, Emerald and their remakes, the player recovers stolen Devon Goods from a Team Aqua or Team Magma member; Mr. Stone thanks them with a PokéNav and asks them to deliver a letter to Steven in Dewford Town, then rewards the delivery with an Exp. Share. He wanted the PokéNav built so he could better understand how Pokémon feel. He collects rare stones, halted Devon's Rusturf Tunnel dig because it disturbed local Pokémon, and traveled the world in his youth with Mr. Briney.
In the anime episode Stairway to Devon he befriends Max, has his PokéNav repaired, and helps foil a Team Aqua thief inside Devon. In Pokémon Adventures he hands Sapphire a letter for Steven before falling into a coma, and later leads the effort, with Steven and old friends Mr. Briney and Drake, to stop a meteoroid headed for Hoenn.
His one card is the Supporter Mr. Stone's Project, which searches either your deck or your discard pile for up to two cards to put into your hand; the Holon Phantoms and Dragon Frontiers reprints word the target as basic Energy. Ken Sugimori illustrated every printing: Emerald (2005, #79), Holon Phantoms (2006, #88) and Dragon Frontiers (2006, #77), all Uncommons.
The card's debut, an Uncommon Supporter illustrated by Ken Sugimori.
The first reprint, from the Delta Species era.
The third printing, released later in 2006.
Joseph Stone, president of the Devon Corporation in Rustboro City and father of Steven Stone.
A PokéNav when the stolen Devon Goods are returned, and an Exp. Share once his letter reaches Steven in Dewford Town.
It is a Supporter that searches your deck or your discard pile for up to two cards and puts them into your hand. The 2006 reprints specify basic Energy cards.
| # | Card | Set | Year | Rarity | Price | 30D | |
|---|---|---|---|---|---|---|---|
| 1 | Mr. Stone's Project | Emerald | 2005 | Uncommon | — | $4.84guide | +8.8% |
| 2 | Mr. Stone's Project | Dragon Frontiers | 2006 | Uncommon | — | $2.02guide | +21.7% |
| 3 | Mr. Stone's Project | Holon Phantoms | 2006 | Uncommon | — | $1.18guide | +2.6% |
Ranked by each card’s main print in near-mint raw condition. 1st Edition, Shadowless and other versions are priced on each card’s page. The table updates live.
The market for Mr. Stone cards is small and lopsided. All 3 of the Mr. Stone cards carry a market value, and the leading card, Mr. Stone's Project from Emerald in 2005, sits well clear of the rest. It is the most valuable Mr. Stone card, and every card in the group is an Uncommon from the EX era, with the priced cards covering 2005 and 2006.
Mr. Stone's Project from Emerald (2005) leads Mr. Stone card value by 2.6 times over the next card, the Dragon Frontiers (2006) version of Mr. Stone's Project. Holon Phantoms (2006) holds the third spot with the same card name. All three are Uncommon prints, so the ranking among these Mr. Stone cards comes down to which set each one appeared in.
Among the 110 characters with priced cards, Mr. Stone ranks 94th by the value of the single leading card. That puts Mr. Stone cards in the lower part of the Trainer character field. With only three cards, one card name and one rarity, the Mr. Stone card market is built around a single Trainer card reprinted across three EX-era sets.
Written from market data as of October 29, 2026; the table updates live.
TRAINER
3 Trainer cards · 0 partner Pokémon
Mr. Stone is the president of the Devon Corporation in Pokémon Ruby and Sapphire and the father of Steven Stone. He gives the player a PokéNav and a letter for Steven. His Supporter, Mr. Stone's Project, was printed in Emerald, Holon Phantoms and Dragon Frontiers.
No published index yet — too few of Mr. Stone’s cards trade often enough to strike one.