together embody the five element concept common in many fictional settings and stemming from both Greek philosophy and Japan's Godai philosophy. Those five being Fire, Water, Earth, Air, and Aether/Void. Bulbasaur represents Earth, Charmander represents fire, Squirtle represents Water, Pikachu represents Air, and Eevee represents Aether or Void.
Hm, I find that a bit of a stretch.
Thinking about it, there really hasn't been any Pokemon group which represented the Four Classical Elements. The closest we've gotten has been the Super Ancient Trio: Groudon, Kyogre, and Rayquaza; the only one we're missing here is Fire which eventually Groudon also represents. Honestly I'm surprised an Elite Four has never been made using them, looking through them the closest we got was Kalos if you have Wikstrom represent Earth and Drasna represent Air.
Actually, wait, there was ONE Pokemon game that semi-directly referenced the Four Classical Elements: the first Pokemon Ranger. At one point in the game you enter a location called the Jungle Relic where you complete a set of four challenges which awakens Entei: Challenge of Water, Challenge of Wind, Challenge of Destruction, and a final challenge which never got a name. Each challenge you faced a "dragon" Pokemon: Water is (two) Kindra, Wind is a Flygon, Destruction is a Salamence, and the final challenge is Charizard. While the challenge names don't line up, the Types of the dragons match with the Classical Elements; Kingdra is Water, Flygon is Earth, Salamence is Air, and Charizard is Fire. FUN FACT: Those four Pokemon appear on the box art of the first game:
