How to get one
The best chance per place. The same table can do better at another hour; the tool gives them all.
Red
| Place | Method | Level | Per attempt |
| Pokémon Mansion 1F |
Grass |
30 |
0.20% |
| Pokémon Mansion 2F |
Grass |
30 |
0.20% |
| Pokémon Mansion 3F |
Grass |
34 |
0.20% |
| Pokémon Mansion B1F |
Grass |
35 |
0.20% |
Blue
| Place | Method | Level | Per attempt |
| Pokémon Mansion B1F |
Grass |
31–33 |
1.94% |
| Pokémon Mansion 2F |
Grass |
30–34 |
1.75% |
| Pokémon Mansion 1F |
Grass |
30–32 |
1.56% |
| Pokémon Mansion 3F |
Grass |
31–35 |
1.37% |
Yellow
| Place | Method | Level | Per attempt |
| Pokémon Mansion B1F |
Grass |
35–38 |
1.56% |
| Pokémon Mansion 2F |
Grass |
26–35 |
1.37% |
| Pokémon Mansion 3F |
Grass |
32–38 |
1.37% |
| Pokémon Mansion 1F |
Grass |
23–26 |
0.79% |
| Power Plant |
Grass |
33–37 |
0.58% |
Gold and Silver
| Place | Method | Level | Per attempt |
| Route 16 |
Grass night |
26–28 |
7.81% |
| Route 17 |
Grass night |
27–29 |
7.81% |
| Route 18 |
Grass night |
26–28 |
7.81% |
| Celadon City |
surf |
15–24 |
1.76% |
Crystal
| Place | Method | Level | Per attempt |
| Route 17 |
Grass night |
29–33 |
9.28% |
| Route 18 |
Grass night |
26–29 |
9.28% |
| Route 16 |
Grass night |
26–28 |
7.81% |
| Celadon City |
surf |
15–24 |
1.76% |
What it becomes
- Grimer becomes Muk at level 38.
Base stats
| Stat | Gen 1 | Gen 2 |
| HP | 80 | 80 |
| Attack | 80 | 80 |
| Defense | 50 | 50 |
| Speed | 25 | 25 |
| Sp. Atk | 40 | 40 |
| Sp. Def | 40 | 50 |
Generation 2 split Special in two, and not down the middle: the two columns are not one value copied twice.