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On switch-in, the wielder shudders if any foe has a super effective or OHKO move. It does not alert the wielder to OHKO moves that cannot hit it. Counter, Metal Burst, and Mirror Coat count as attacking moves of their respective types, while Bide, Hidden Power, Judgment, Natural Gift, Techno Blast, and Weather Ball are considered Normal-type moves. Anticipation will immediately activate whenever the ability is acquired, such as through Skill Swap or Role Play.
Anticipation is mediocre competitively and in-game. Unlike most other competitively useless abilities, it doesn't have an in-game benefit. Toxicroak and Whiscash have better abilities, even though in Whiscash's case, Oblivious is still pretty useless. It is Wormadam's only non-Dream World ability, but Wormadam shouldn't ever be used regardless. With OHKO moves being banned in standard play, half of Anticipation's purpose is removed. It doesn't distinguish the individual moves themselves, so it provides little information anyway.
Found in Dream World