100% agree, but I have another reason. Groudon is epic because he causes a huge drought and can evaporate the ocean.My Favorite Legendary Pokemon from Generation 3 is Groudon.
Groudon is an amazing Pokemon. I just love its design which seems to resemble some kind of dinosaur. Due to its appearance it has drawn comparison to the Tyrannosaurus and from various species of Ankylosauria, such as Euoplocephalus.
Also in the Anime,
Groudon battled fiercely against Kyogre in episode "The Scuffle of Legends", Which Resulted in a win for Groudon.
Groudon is definitely one of my favorite legendaries of all-time.