Overgrow Ability powers up Grass-type moves when the Pokémon is in trouble (by 1.5x if pokemon has 1/3 or less of its HP remaining).
Pokemon list with Overgrow Ability
| Bulbasaur | Overgrow | Chlorophyll | |
| Ivysaur | Overgrow | Chlorophyll | |
| Venusaur | Overgrow | Chlorophyll | |
| Chikorita | Overgrow | Leaf Guard | |
| Bayleef | Overgrow | Leaf Guard | |
| Meganium | Overgrow | Leaf Guard | |
| Treecko | Overgrow | Unburden | |
| Grovyle | Overgrow | Unburden | |
| Sceptile | Overgrow | Unburden | |
| Turtwig | Overgrow | Shell Armour | |
| Grotle | Overgrow | Shell Armour | |
| Torterra | Overgrow | Shell Armour | |
| Snivy | Overgrow | Contrary | |
| Servine | Overgrow | Contrary | |
| Serperior | Overgrow | Contrary | |
| Pansage | Gluttony | Overgrow | |
| Simisage | Gluttony | Overgrow | |
| Chespin | Overgrow | Bulletproof | |
| Quilladin | Overgrow | Bulletproof | |
| Chesnaught | Overgrow | Bulletproof | |
| Rowlet | Overgrow | Long Reach | |
| Dartrix | Overgrow | Long Reach | |
| Decidueye | Overgrow | Long Reach | |
| Grookey | Overgrow | Grassy Surge | |
| Thwackey | Overgrow | Grassy Surge | |
| Rillaboom | Overgrow | Grassy Surge |