OOYAMA is a historically important Pokemon TCG credit because it points back to Kouichi Ooyama, one of the original designers of the Pokemon Trading Card Game. Research sources connect Ooyama with early TCG design, the Dr. Ooyama character in the Pokemon TCG video game and later illustration work under the OOYAMA credit. That gives the profile a different weight from a normal illustrator page: it is part card art, part game-design history.
Original TCG design history and playful modern card art
In the local database, OOYAMA cards include Vanillite, Exeggcute, Kecleon, Magikarp and Wailord GX, Palossand, Mr. Mime, Inkay, Weezing, Hypno, Trubbish, Pyukumuku, Pachirisu, Eelektrik, Wailord, Beartic, Cubchoo, Moltres, Shelmet, Karrablast, Turtwig, Paras and Tangela. ThePriceDex highlights Magikarp and Wailord GX as the major collector anchor, with Moltres also visible among the higher-value entries.
The appeal of OOYAMA cards is often playful and odd. Magikarp and Wailord GX is the obvious centerpiece because it is large, funny, memorable and market-visible. But the smaller cards are just as important for understanding the credit. OOYAMA often works well with Pokemon that can be humorous, awkward or strongly shaped: Kecleon, Pyukumuku, Trubbish, Hypno, Beartic and Exeggcute all fit that lane.
For collectors, OOYAMA is a satisfying artist run because it combines history with personality. It is not just about chase value. The credit connects the foundations of the TCG with later cards that still feel playful, graphic and unmistakably Pokemon.
Referenced from thepricedex.com, tcg-placeholder.com, game8.co, pocket.pokemongohub.net.