PokéBase - Pokémon Q&A
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Can Pokemon go up or down a tier before a new generation? And what make Pokemon more used than others? Eg. Stats, moves, etc. Thanks!

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Yes, Pokémon can move tiers in the middle of a generation, for example Aegislash and Mega Mawile were recently banned to Ubers after a long stay in OU.

Pokémon are used simply due to their viability in the metagame. A Pokémon's use is often determined mainly by their:

  • Stats (Arceus is in Ubers because it has such a high BST)
  • Abilities (Mega Mawile is used extremely often due to having Huge Power)
  • Movepool (One of the main reasons Breloom is in OU is because he is one of the few Pokemon that has access to Spore)
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Thanks a lot!