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As a professional Pokémon player, I can provide a well-considered rationale for this. Groudon, despite its fiery design, is not a Fire-type Pokémon; instead, it's a Ground-type. This can seem a bit counterintuitive, especially given that its Primal Reversion, Primal Groudon, is both Ground and Fire-type. However, there are several reasons why Groudon could be primarily Ground-type.
First, Groudon is part of a legendary trio with Kyogre and Rayquaza, representing the land, sea, and sky, respectively. As such, Groudon being a Ground-type emphasizes its role as the embodiment of the earth or land, keeping with the overall theme of the trio.
Second, Groudon's Ground typing may be influenced by mythologies and folklore where earth or land-based creatures are often depicted as massive and powerful, much like Groudon. They are typically portrayed as beings capable of causing earthquakes, shaping the land, or even creating it, which is precisely what Groudon does according to Pokémon lore.
Third, the Ground typing provides a direct contrast to Kyogre's Water typing in terms of their battle mechanics. This represents their roles as natural opposites in the Pokémon world, leading to their legendary conflict in the Hoenn region's lore.
That said, when Groudon undergoes Primal Reversion to become Primal Groudon, it gains the Fire-type. This could be interpreted as the primal energy it absorbs awakening some dormant volcanic or magma-like powers, enhancing its association with geothermal phenomena and giving it a more destructive edge in line with the cataclysmic events that occur in Omega Ruby and Alpha Sapphire when Groudon and Kyogre clash.
It's important to remember that Pokémon typing isn't strictly bound to a Pokémon's appearance. It's a blend of various factors like the creature's role in the game's lore, balance within the game mechanics, and its thematic inspirations.
