What does uu mean in pokemon

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Last updated: April 4, 2026

Quick Answer: In Pokémon, 'UU' stands for 'Under Used', which is a tier in competitive battling. It designates a group of Pokémon that are not powerful enough to be consistently used in the top tiers (like OU - Over Used) but are still viable and frequently seen in play.

Key Facts

What Does 'UU' Mean in Pokémon?

In the vibrant and ever-evolving world of Pokémon, particularly within its competitive battling scene, you'll often encounter various acronyms and terms used to categorize Pokémon. One such term is 'UU', which stands for 'Under Used'. This designation is not arbitrary; it's a crucial element of the metagame, helping to structure battles and create balanced environments for players of all skill levels.

Understanding Pokémon Tiers

The concept of tiers in Pokémon competitive battling is fundamental to understanding what 'UU' signifies. Tiers are essentially rankings that group Pokémon based on their usage statistics in battles. The most common tiering system, often referred to as Smogon tiers (named after the popular competitive Pokémon website Smogon University), divides Pokémon into categories like OU (Over Used), UU (Under Used), RU (Rarely Used), NU (Never Used), and PU (Partially Used), among others.

The primary purpose of these tiers is to create distinct metagames. A metagame, in this context, refers to the current state of competitive play, including the most popular Pokémon, strategies, and counter-strategies. By separating Pokémon into tiers, players can engage in battles where the Pokémon they encounter are generally of similar power levels and strategic viability. This prevents battles from being dominated by a small handful of overwhelmingly powerful Pokémon found in the top tiers.

The 'Under Used' (UU) Tier Explained

The 'UU' tier specifically encompasses Pokémon that, according to usage statistics, are not popular enough to be considered 'Over Used' (OU) but are still frequently used and effective. Think of it as the tier for Pokémon that are strong contenders but don't quite break into the absolute top echelon of competitive play. These Pokémon often possess unique abilities, move sets, or stat distributions that make them valuable in specific strategies or as niche picks.

The threshold for a Pokémon to be classified as UU can vary slightly depending on the specific tiering system or community. However, the general principle remains consistent: if a Pokémon's usage rate falls below a certain percentage in the tier above it (typically OU), it gets relegated to the UU tier. Conversely, if a Pokémon's usage rate in UU becomes too high, it might be 'banned' from UU and promoted to OU, or if its usage is too low, it might be demoted to a lower tier.

Why UU Matters in Competitive Pokémon

The UU tier plays a vital role in the competitive Pokémon landscape for several reasons:

How Tiers are Determined

The determination of tiers, including UU, is typically based on rigorous data analysis. Websites like Smogon University collect battle data from a large number of players participating in specific formats (e.g., Singles OU, Doubles OU). They then analyze the usage statistics of each Pokémon. If a Pokémon is used by more than a certain percentage of players (e.g., 4-5% in OU), it remains in that tier. If its usage falls below that threshold, it gets moved down to the next tier (UU).

This process ensures that the tier lists are reflective of actual competitive play. It's a community-driven effort, constantly updated to reflect the current state of the game. Understanding these tiers is crucial for anyone looking to participate seriously in competitive Pokémon battles, as it dictates which Pokémon are commonly encountered and what strategies are most effective within that specific tier.

Conclusion

'UU' in Pokémon simply means 'Under Used', referring to a tier in competitive battling that houses Pokémon not commonly found in the top-tier metagames but still possessing significant strategic value. It's a testament to the depth and complexity of Pokémon's competitive scene, offering a balanced and diverse environment for players to test their skills and creativity.

Sources

  1. XY OU Viability Ranking Thread - Smogon Universityfair-use
  2. Metagame - Bulbapedia, the community-driven Pokémon encyclopediaCC-BY-SA-3.0

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