Chatter inflicts damage and may confuse the target. Pokémon with the Ability Soundproof are not affected by this move. If the move has recorded audio from its field move functionality, that audio will play for the move's sound effect instead of Chatot's regular cry.
If Chatter has no audio data (as is the case for wild and NPC-owned Chatot), the chance of confusion is 1%. Otherwise, the chance of confusing the foe is determined by the volume of the recording.
Generally, the higher the volume of the recording is, the higher the chance of confusion. The recording is stored as a 1000-byte structure within the game as a 4-bit PCM (pulse-code modulation) recording. When a sound is recorded, 1984 8-bit samples of microphone input are taken at roughly 2000 samples per second. 16 zero bytes are appended onto the end of this recording to create a 2000 byte 8-bit PCM recording, which is then downsized to a 4-bit PCM recording via a translation table:
|| -127 - -112
|| -111 - -96
|| -95 - -80
|| -79 - -64
|| -63 - -48
|| -47 - -32
|| -31 - -16
|| -15 - 15
|| 16 - 31
|| 32 - 47
|| 48 - 63
|| 64 - 79
|| 80 - 95
|| 96 - 111
|| 112 - 127
To pack two 4-bit samples into a byte, the first sample takes up the lower four bits and the second sample takes up the upper 4 bits. Now, depending on the value of the 16th byte in the 1000-byte 4-bit PCM recording (corresponding to the 31st and 32nd samples from the original), the chance of confusion is as follows:
|| Confusion odds
| -31 or less
| -30 to 29
| 30 or more
The volume level roughly corresponding to the specific values are given in the table. Note that since the sample is near the beginning of the recording, it is not necessary to maintain a high volume throughout the recording.
The odds of confusion are not affected by Serene Grace, but are affected by Shield Dust.
Chatter can hit non-adjacent opponents in Triple Battles.
If Chatter has no audio data, the chance of confusion is now 0%.
Generation V games record 8000 8-bit samples at 8000 samples per second for its recordings, and convert every fourth sample taken from these, starting with the first sample, to the 1000-byte 4-bit PCM recording in the same manner as that of Generation IV. However, instead of one byte determining the confusion odds, the exclusive or of three bytes, the 100th, 500th, and 700th bytes (corresponding to the 397th, 401st, 1997th, 2001st, 2797th and 2801st samples of the original recording), are taken. The odds of confusion are calculated as follows:
|| Confusion odds
| 99 or less
| 100 to 149
| 150 or more
Thus, it is necessary to maintain medium or high volume in roughly the first quarter-second for the maximum odds of confusion. The confusion odds are affected by Shield Dust, Serene Grace, Sheer Force, and the combined effect of Water Pledge and Fire Pledge.
Generation VI onwards
Chatter's power was changed from 60 to 65.
Chatter can no longer be used outside of battle to record sound; it will now always confuse the target. Despite the removal of its field move functionality, Chatter still cannot be copied by Sketch. But Chatter can be copied by Mirror Move.
Outside of battle
In Generations IV and V, Chatter can be used as a field move to record audio using the Nintendo DS's microphone. This audio will then play as Chatot's cry, as well as when Chatot uses Chatter. Audio recorded for Chatter gets distorted, possibly as a failsafe to prevent inappropriate language from being played back.
If Chatot is deposited in the PC, the recorded audio is reset to Chatot's default cry.