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The wielder ignores Reflect, Light Screen, Safeguard, and Mist when attacking the opponent. These effects can still be ended by an attack, such as Brick Break.
Most of the Pokemon that have access to Infiltrator have better options. Crobat might find it useful in offensive sets, but in the most common cases, Whimsicott would prefer Prankster, and Jumpluff isn't realistically ever going to face Safeguard, even if it wants to use Sleep Powder. Reflect and Light Screen aren't massive worries, and it is usually more effective to just Brick Break them away.
Found in Dream World