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In order from when I found them.
Machop - Fire Red (Lost. Save he was on was deleted)
Zigzagoon, now Linoone - Emerald (Still own, currently on Alpha Sapphire, first Pokemon I transferred to it)
Pidgey - Heart Gold (Found it in a Nuzlocke of the game that I gave up almost immedietly, didn't have Pokeballs yet)
Shedinja - Black (Found it in a Randomizer Nuzlocke, obviously I don't really count it but it happened nontheless. Save was deleted)
Gulpin - X (Still on X, found it 11-ish hours before I found a Shiny Sandile)
Sandile - X (Still on X, found it 11-ish hours after I found a Shiny Gulpin)
Drowzee - X (Got in on WonderTrade, from what I can tell it's legit. Level 30, caught in Friend Safari, etc)
Audino - X (Still on X, caught in Friend Safari)
and my most recent
Shiny Magikarp, now Gyarados - Alpha Sapphire (Caught in Petalburg Ciy. It ended up being in my team)