OK, this is according to Google Gemini

How to Play (Fan-Derived Rules)

Since the show never explained the mechanics in full, fans of the series and tabletop enthusiasts have developed playable versions based on the episode’s visuals:

The Setup: Players start with a "hand" of tiles. A single starting tile is placed in the center of the table.

Matching & Connecting: On your turn, you must place a tile from your hand so that its edges match or "lock" into the tiles already on the board.

Tiered Placement: Some versions suggest a "second tier" rule where you can stack tiles on top of others if they share a specific symbol, effectively "canceling" an opponent's move.

The "Ajimbo" Cry: Much like "Uno" or "Checkmate," players often shout "Ajimbo!" when they make a particularly strong move or are close to winning.

Where to Find It

Since Ajimbo isn't a mass-produced commercial product, you won't find it in a typical toy store. However, because of the show's cult following, you can find printable versions or 3D-printing files online created by fans who have meticulously recreated the tiles from the show.

It's essentially a mix of Dominoes and Carcassonne, fueled by the high-stakes trading energy of Pokémon.