| 1 | Red, Blue | Appears in filthy areas. Thrives by sucking up polluted sludge that is pumped out of factories. |
| 1 | Yellow | Made of hardened sludge. It smells too putrid to touch. Even weeds won't grow in its path. |
| 1 | Stadium | Sludge that was transformed when exposed to X-rays from the moon. Loves sludge, industrial waste and other refuse. |
| 2 | Gold | As it moves, it loses bits of its body from which new Grimer emerge. This worsens the stench around it. |
| 2 | Silver | Wherever Grimer has passed, so many germs are left behind that no plants will ever grow again. |
| 2 | Crystal | When two of these Pokémon's bodies are combined together, new poisons are created. |
| 2 | Stadium 2 | As it moves, it loses bits of its body from which new Grimer emerge. This worsens the stench around it. |
| 3 | Ruby | Grimer's sludgy and rubbery body can be forced through any opening, however small it may be. This Pokémon enters sewer pipes to drink filthy wastewater. |
| 3 | Sapphire | Grimer emerged from the sludge that settled on a polluted seabed. This Pokémon loves anything filthy. It constantly leaks a horribly germ- infested fluid from all over its body. |
| 3 | Emerald | Born from polluted sludge in the sea, Grimer's favorite food is anything filthy. They feed on wastewater pumped out from factories. |
| 3 | FireRed | Sludge exposed to X rays from the moon transformed into Grimer. It loves feeding on filthy things. |
| 3 | LeafGreen | Appears in filthy areas. It thrives by sucking up polluted sludge that is pumped out of factories. |
| 4 | Diamond, Pearl, Platinum | It was born when sludge in a dirty stream was exposed to the moon's X-rays. It appears among filth. |
| 4 | HeartGold | As it moves, it loses bits of its body from which new Grimer emerge. This worsens the stench around it. |
| 4 | SoulSilver | Wherever Grimer has passed, so many germs are left behind that no plants will ever grow again. |
| 5 | Black, White | It was born when sludge in a dirty stream was exposed to the moon's X-rays. It appears among filth. |
| 5 | Black 2, White 2 | Born from sludge, these Pokémon now gather in polluted places and increase the bacteria in their bodies. |
| 6 | X | Sludge exposed to X-rays from the moon transformed into Grimer. It loves feeding on filthy things. |
| 6 | Y | Appears in filthy areas. It thrives by sucking up polluted sludge that is pumped out of factories. |
| 6 | Omega Ruby | Grimer's sludgy and rubbery body can be forced through any opening, however small it may be. This Pokémon enters sewer pipes to drink filthy wastewater. |
| 6 | Alpha Sapphire | Grimer emerged from the sludge that settled on a polluted seabed. This Pokémon loves anything filthy. It constantly leaks a horribly germ- infested fluid from all over its body. |
| 7 | Sun | Its main source of food is the slimy industrial waste of factories. This Pokémon's numbers have been decreasing in recent years. |
| 7 | Moon | It was born from sludge transformed by exposure to X-rays from the moon. When its internal load of germs decreases, it dies. |
| 7 | Ultra Sun | It was born from sludge on the ocean floor. In a sterile environment, the germs within its body can't multiply, and it dies. |
| 7 | Ultra Moon | The wastewater coming from factories is clean these days, so Grimer have nothing to eat. They're said to be on the verge of extinction. |
| 7 | Let's Go, Pikachu!, Let's Go, Eevee! | Made of congealed sludge. It smells too putrid to touch. Even weeds won't grow in its path. |
