Kabuto and Omanyte? As the two with overlap, I mean. I had a feeling that might be the case though...that's the only way I have ever seen people get them. Either in those random eggs we sometimes get for Christmas and Easter or as their starter. Or as an egg from somebody else who got them from one of those two places. Maybe you could try asking about it? Like on the network I mean.

If not, you could always try asking at the Pewter museum when you make it over here to Kanto.