One of Neo's Kick the Dog moments involves ordering one of his own monsters to delete itself because it could not get the enemy to show enough for him to scan. Since it's not directly built for that though, they have to actively scan various enemy actions on a case by case basis to get the full story.
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But they also have two glaring design flaws: one, they can be fooled (as it only detects the target's current, and not potential, ability), and two, they can't handle a sudden large increase in data, so if someone powers up enough, it can cause them to explode. Dragon Ball Z features "Scouters", special devices worn over the eyes which can measure the Power Levels of enemies.
In the Pokémon Adventures manga, the dex also allows various in-game functions like trading, canceling evolutions, stat pages and HP bars.In the Sinnoh arc, it was revealed it could identify the stats and moves of caught Pokémon, which Paul often used to check new captures to see what they were capable of, and releasing them if they didn't suit his preferences. The Pokédex in the Pokémon anime scans monsters and pulls up a database written by either the main series professors or a Prof.