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Prevents critical hits from occurring on all Pokemon in the user's party for five turns. Fails if this move is already in effect for the user's side.
Lucky Chant has little competitive use, and thus is rarely seen. Critical hits are rare, and there are better choices for a moveslot in most cases. Furthermore, five turns is too little for protection from critical hits to be feasible.
Safeguard is a similar move that prevents status effects for five turns.