Here's why we don't see a specific enemy for Articuno:
* Legendary status: Legendary Pokémon are generally isolated and powerful, not usually engaging in traditional rivalries.
* Neutral nature: Articuno is often portrayed as a peaceful and serene creature, focusing on its own existence rather than seeking out conflict.
* Lack of lore: The Pokémon universe doesn't have extensive lore on the personal relationships of Legendary Pokémon.
However, there are some instances where you could argue for a potential rivalry:
* Zapdos and Moltres: These are the other two Legendary birds, and they often appear together, suggesting a connection. Depending on the interpretation, they could be considered rivals due to their different elements and powers.
* Other powerful Pokémon: Any Pokémon powerful enough to challenge Articuno could potentially be seen as an enemy, though this is speculative and not explicitly stated in the lore.
Ultimately, Articuno's lack of a specific enemy is more about its nature and the focus of the Pokémon universe on individual trainers and battles rather than complex rivalries between Legendary Pokémon.