First was in Silver: green Zubat in Slowpoke's Well. Latest was an Emolga on Unova Route 16, during the Emolga Funest mission. Best was the shiny Volcarona with great stats and nature in White 1. --- The Army of Gilgamesh is dead. Rest in Peace... Official Thief of Light of the Dissidia Duodecim boards
Since the Shiny Gyarados in GSC doesn't count, and I'm not counting the shinies I hacked in Gen 2 either, I've have to say that my first Shiny was a Zigzagoon in Ruby.
Unfortunately, I no longer have him, as I used to item hack in the day and would save with all these codes on at the same time, and one day my Vaporeon turned into a Bad Egg because of it, so I pretty much quarietined that file. Pretty much stopped me using AR altogether until Gen 4 when I would clone Pokemon and nothing more.
It wouldn't be until years later that I remembered that I had a Shiny EB Games Zigzagoon on my Pokemon Box file and then I would later hatch a shiny Zizagoon in Black. Both are still untouched.
I have so many more shinies but since the topic isn't about that and not going to bore anyone, I'll save it. --- Currently playing: Capcom VS SNK 2(Gamecube), Pokemon Platinum/Heartgold(JPN)
I got a golden geodude in diamond,a purple wurmple in Ruby,the shiny event porygon-z in black,a shiny tentacruel in gold (can't remember the colour),and a shiny gastly in diamond. --- The sheep are falling from the skyyyyyyyy!!!!!! 3DS:FC 5026-4475-7528
First non 100% guaranteed: Shiny Magby from the Odd Egg in Crystal
First totally random shiny that randomly spawned: Shiny Claydol in the Sky Pillar in Ruby. --- Bullet Hell fan, Cave and Touhou lover. <3 Patchouli Knowledge. Playing: DeathSmiles, Fire Emblem 8, Rune Factory 3, Digimon World Dawn, Tales of Vesperia
Sadly, even though i have played all of the games for hundreds of hours, my first shiny was in Black. It was a Darumaka, but then i got excited and accidently pressed Run, facepalmed so hard. My 2nd shinyf and 1st that i caught was a boldore in giant chasm while i was trying to get a shiny stone from dust clouds.
My first shiny in B/W2 (3rd total), was a shiny frillish i found while surfing to seaside cave, the most current shiny i've encountered was actually today, a shiny sandslash on route 15 was the first pokemon i encoutered there. --- "The strong one doesnt win. The one that wins is strong."