an Entity in Data Space: 134.155.108.49:8890
I don't think you can catch Mankey in Crystal. You most likely need to trade with Pokemon Yellow, Red and Blue. This article here talks a bit more about it:
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/6cEm1MfE2xFXaoavZAL6gg== | 5.88129e-14 |