GrassWhistle puts the target to sleep. It will not affect a target that already has a major status ailment, a Substitute, or Insomnia, Vital Spirit, or Soundproof as their ability.
Template:Breedlist
|-
| style="background: #FFF; font-family:monospace,monospace" | 0001
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Bulbasaur
| colspan="1" style="background:#3FA129; text-align: center;" | Grass || style="background:#9141CB" align="center" colspan="1" rowspan="1" | Poison
| style="background: #FFF" | Roselia
|-
| style="background: #FFF; font-family:monospace,monospace" | 0152
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Chikorita
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Roselia
|-
| style="background: #FFF; font-family:monospace,monospace" | 0191
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Sunkern
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Roselia
|-
| style="background: #FFF; font-family:monospace,monospace" | 0331
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Cacnea
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Roselia
|-
| colspan="6" | Bold indicates a Pokémon which gets STAB from this move. Italic indicates a Pokémon whose evolution gets STAB from this move. *Indicates Pokémon that can only learn the move through chain breeding.
|}
|}
Template:Breedlist
|-
| style="background: #FFF; font-family:monospace,monospace" | 0001
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Bulbasaur
| colspan="1" style="background:#3FA129; text-align: center;" | Grass || style="background:#9141CB" align="center" colspan="1" rowspan="1" | Poison
| style="background: #FFF" | Sunkern, Sunflora Roselia, Roserade Snover, Abomasnow
|-
| style="background: #FFF; font-family:monospace,monospace" | 0152
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Chikorita
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Sunkern, Sunflora Roselia, Roserade Snover, Abomasnow
|-
| style="background: #FFF; font-family:monospace,monospace" | 0191
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Sunkern
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Sunkern, Sunflora Roselia, Roserade Snover, Abomasnow
|-
| style="background: #FFF; font-family:monospace,monospace" | 0252
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Treecko
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Snover, Abomasnow
|-
| style="background: #FFF; font-family:monospace,monospace" | 0331
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Cacnea
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Sunkern, Sunflora Roselia, Roserade Snover, Abomasnow
|-
| style="background: #FFF; font-family:monospace,monospace" | 0420
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Cherubi
| colspan="2" style="background:#3FA129; text-align: center;" | Grass
| style="background: #FFF" | Sunkern, Sunflora Roselia, Roserade Snover, Abomasnow
|-
| colspan="6" | Bold indicates a Pokémon which gets STAB from this move. Italic indicates a Pokémon whose evolution gets STAB from this move. *Indicates Pokémon that can only learn the move through chain breeding.
|}
|}
Snover picks up a blade of grass, puts it up to its mouth and starts blowing on it. The blade of grass starts to glow green, and when the opponent hears the music, it falls asleep.