After the battle for the Gold Print in Pokémon Diamond, Pearl, and Platinum he makes a reference to the first to Gen.IV games stating that he and the player's in game father went out to "the lake" where they were attacked by Pokémon and had to fend them off. But claims not to remember how.
Palmer has the same voice actor as Link From Legend of Zelda: Ocarina of Time.
Palmer sends out Dragonite in Twinleaf Town. Some of the inhabitants remember Dragonite.