Captured:
Marowak (FireRed)
Meditite (Diamond) - Evolved to Medicham.
Drowzee (SoulSilver)
Fearow (SoulSilver)
Failed to capture:
Zubat (Sapphire) - I was in the underwater Team Aqua cave and had captured many Zubats. I didn't know what a shiny Pokémon was back then and when I had decided to capture Zubat I had already apparently pressed run. FAAAIL!!!
Koffing (Diamond) - I found it when I explored Stark Mountain with Buck (a NPC). When your in a double battle against wild Pokémon you have to knock one out in order to be able to catch the other. I knocked the other Pokémon out, Koffing didn't use Selfdestruct, but Buck's Claydol knocked Koffing out. I HATE YOU BUCK!!!
Pidgeotto x 2 (SoulSilver) - Whirlwind x 2. Now, what's the odds of that? XD
None of these Pokémon where encountered by building chains with the PokéRadar or the Masuda Method, just plain luck.