The player can return the Gold Teeth to their owner, the Safari Zone Warden, to have him teach the Secret Technique Strong Push to their partner Pokémon.
The Gold Teeth appeared in PZ07. Satoshi first heard of them from the Safari Zone Warden's assistants. Later, while exploring the Safari Zone, Satoshi fished up a Dratini, which a Fisherman asked Satoshi to trade for him in exchange for the numerous Water Pokémon he had caught. At first, Satoshi was hesitant, but when he saw the Gold Teeth inside one of the Fisherman's Poké Balls, he accepted the offer. Along the way back to the Warden, Satoshi met Koga, who revealed that he had stolen the dentures as a form of protest for the Warden having built Safari Zone at what used to be a ninja village. Satoshi eventually returned the dentures to the Warden, restoring his ability to speak properly.
In the TCG
Crown Zenith Hoopa V card (in the lower right corner)
The Gold Teeth are seen in the artwork of the Hoopa V card from the Crown Zenith expansion.