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Mateo (Japanese: イサオ Isao) is a character of the day who appeared in The Crystal Onix.

Mateo and his younger sister Marissa live on Sunburst Island in the Orange Archipelago. Mateo owns a glass shop (inspired by his grandfather), but his products are lower quality than the other glass makers on the island. One shop owner yelled at Marissa claiming her brother was ruining the glass business on the island.

Mateo's ultimate goal was to capture the legendary Crystal Onix. With the help of Tracey's Venonat and Marill, he found the Pokémon in a cave. Using his Pokémon, he weakened it, but out of nowhere, decided not to capture it. He told Ash and his friends that just seeing the Crystal Onix had inspired him.

When he returned to his glass shop, just like his grandpa, Mateo was able to make much better quality glass pieces and soon his business greatly improved. As a memento of thanks, Mateo gave Ash a Pikachu glass figurine.


This article is missing information on this character's Japanese voice actor.
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On hand

Mateo's Cloyster
Mateo's Cloyster made a brief appearance when Mateo was trying to capture the Crystal Onix. It used Water Gun but it was useless, because the Onix was made of glass. Onix defeated Cloyster with a Tackle.

Cloyster's only known move is Water Gun.

Debut The Crystal Onix
Voice actors
English Eric Stuart
Mateo's Charmeleon
Mateo's Charmeleon is used to make glass at his shop and made an appearance battling the Crystal Onix. After Cloyster had been defeated, Charmeleon used Fire Spin, setting the Onix on fire. However, once Mateo saw the fainted Pokémon, he had all the inspiration he needed. Charmeleon was last seen making a Pikachu glass figurine for Ash.

Charmeleon's known moves are Fire Spin* and Flamethrower.

Debut The Crystal Onix
Voice actors
English Eric Stuart


Crystal Onix.png
Crystal Onix

Voice actors

Language Voice actor
Japanese 私市淳 Atsushi Kisaichi
English Buddy Woodward
Norwegian Trond Teigen
Polish Artur Krajewski
Brazilian Portuguese Vágner Fagundes
Spanish Latin America Eduardo Garza
Spain Miguel Ángel Garzón

Project COD logo.png This article is part of Project COD, a Bulbapedia project that aims to write comprehensive articles on each one-time character of the Pokémon anime.