Pokémon Black Version and Pokémon White Version - Switching Out
When a Pokémon enters the battle, the following effects are applied in order:
- Healing Wish/Lunar Dance
- Toxic Spikes/Stealth Rock/Spikes (applied in the order in which they came into effect; Toxic Spikes applies even if the Pokémon faints because of Spikes/Stealth Rock)
- Abilities
If more than one Pokémon is chosen when Pokémon are switched in from fainted ones, the above effects don’t happen until all those Pokémon enter the battle (resolved in order of Speed, taking Trick Room into account). At any other time when more than one Pokémon is chosen, the effects happen immediately after the Pokémon enters the battle.
If more than one Pokémon is switched in from fainted ones at the same time, their controllers choose both the new Pokémon to be switched in and their positions, where the choices are revealed only after all those players have finished making their choices.
At the beginning of a battle, however, all Pokémon enter the battle, then the above effects resolve for each Pokémon, from highest to lowest Speed.