AnticipationNotifies all trainers upon entering battle if an opponent has a super-effective move, Self-Destruct, Explosion, or a one-hit KO move.
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Dry SkinCauses 1/8 max HP in damage each turn during strong sunlight, but heals for 1/8 max HP during rain. Increases damage from Fire moves to 1.25×, but absorbs Water moves, healing for 1/4 max HP.
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Poison TouchocultaHas a 30% chance of poisoning target Pokémon upon contact.
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Pokédex
The croaking that Toxicroak produces before a battle is for churning the poison it has stored in its poison sac.
It has a poison sac at its throat. When it croaks, the stored poison is churned for greater potency.