Why do Pokemon trainers black out?

Why do Pokemon trainers black out? The player will black out (Japanese: 目の前が真っ暗になる lose hope, lit. plunge into darkness) when all the Pokémon on the player’s team faint. This is comparable to a game over screen for the Pokémon games. It generally occurs in battle but it can also occur in the overworld due to the effects of poison prior to Generation IV.

The player will black out (Japanese: 目の前が真っ暗になる lose hope, lit. plunge into darkness) when all the Pokémon on the player’s team faint. This is comparable to a game over screen for the Pokémon games. It generally occurs in battle but it can also occur in the overworld due to the effects of poison prior to Generation IV.
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