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If the holder moves after the target in the same turn, this item boosts the holder's accuracy by 20%.
Hmm. Well, Zoom Lens is pretty good in theory, as a miss can often be the factor that loses you the game, especially if it happens at a critical moment. An extra 20% accuracy is pretty significant, too—it can turn the most horribly inaccurate moves in the game, such as Focus Blast, from horrible 70% accuracy to not-too-shabby 84%, as well as making every move of 83% accuracy and above—sadly just missing out on the infamous Stone Edge—100% likely to hit the target. So what's the problem? Unfortunately, the activation cost that the holder has to move last is pretty high, as it means that this item is basically useless for fast sweepers who could really make use of it, and thus it is relegated to those much slower, bulkier threats. Even so, these defensive Pokemon could easily make use of it in order to increase the accuracy of inaccurate status moves such as Toxic, Will-O-Wisp, and Hypnosis, but they will miss their Leftovers terribly.
Castelia City - Talk to man in Pokemon Center after having acquired 20 different outsider ID numbers.