Priority is one of the characteristics that define a move. Just like power, accuracy, PP, or category, every move has a specific priority. In a battle, the Pokémon with the highest Speed is supposed to always attack first. However, this is not always true, since it is a matter of priority first, and Speed after. Only when two moves with the same priority are used in the same turn will the fastest Pokémon strike first.

The move Quick Guard will block high-priority moves.

In Pokémon Uranium, the ability Acceleration boosts high-priority moves by 1.5x.

You can find what moves are affected (positively or negatively) by priority in the following list:

+5 Helping Hand
+4 Detect, Endure, Magic Coat, Protect, Spiky Shield, Snatch

Fake Out, Quick Guard, Wide Guard

+2 Extreme Speed, Feint, Flame Impact, Follow Me
+1 Aqua Jet, Baby-Doll Eyes, Bide, Bullet Punch, Ice Shard, Ion Deluge, Mach Punch, Powder, Quick Attack, Shadow Sneak, Sucker Punch
0 Any other move
-1 Vital Throw
-2 None
-3 Focus Punch
-4 Avalanche, Revenge
-5 Counter, Mirror Coat
-6 Dragon Tail, Roar
-7 Trick Room
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