Where two kinds of poison gases meet, 2 Koffings can fuse into a Weezing over many years. It lives and grows by absorbing dust, germs and poison gases that are contained in toxic waste and garbage.
| Name | Type | Power | Accuracy | PP | Effect |
| Bide | Normal | -- | -- | 10 | User takes damage for two turns then strikes back double. |
| Double Team | Normal | -- | -- | 15 | Raises user's Evasiveness. |
| Explosion | Normal | 250 | 100 | 5 | User faints. |
| Fire Blast | Fire | 110 | 85 | 5 | May burn opponent. |
| Haze | Ice | -- | -- | 30 | Resets all stat changes. |
| Hyper Beam | Normal | 150 | 90 | 5 | User must recharge next turn. |
| Mimic | Normal | -- | -- | 10 | Copies the opponent's last move. |
| Rage | Normal | 20 | 100 | 20 | Raises user's Attack when hit. |
| Rest | Psychic | -- | -- | 5 | User sleeps for 2 turns, but user is fully healed. |
| Self-Destruct | Normal | 200 | 100 | 5 | User faints. |
| Sludge | Poison | 65 | 100 | 20 | May poison opponent. |
| Smog | Poison | 30 | 70 | 20 | May poison opponent. |
| Smokescreen | Normal | -- | 100 | 20 | Lowers opponent's Accuracy. |
| Substitute | Normal | -- | -- | 10 | Uses HP to creates a decoy that takes hits. |
| Tackle | Normal | 40 | 100 | 35 | |
| Thunder | Electric | 110 | 70 | 10 | May paralyze opponent. |
| Thunderbolt | Electric | 90 | 100 | 15 | May paralyze opponent. |
| Toxic | Poison | -- | 90 | 10 | Badly poisons opponent. |