Prevents the foe from escaping.
Shadow Tag is an ability introduced in Generation 3. So far, 2 Pokémon have this ability.
Shadow Tag prevents all foes that are not Ghost-type from fleeing or switching out while the bearer is on the field.
Using Baton Pass, U-turn, or Volt Switch allows the user to switch out, but not flee. Having the Ability Run Away or holding a Smoke Ball allows the Pokémon to flee or Teleport, but not switch. In this way, it can be considered a Ghost counterpart to Arena Trap.
Outside of battle
Shadow Tag has no effect outside of battle.
Pokémon with Shadow Tag