3rd Gen Your First Shiny

My first shiny was a Pidgey from my brother's LeafGreen,
I said my because when I was borrowing his game, I was the one who encountered it!

My first shiny was a Golbat in HG, but my first (and only) shiny I've encountered in gen 3 was a Loudred. I tried to use it to calculate my secret i.d., and thus perform RNG manipulation, but I wasn't able to.

My first in Gen III was a Relicanth. My sister erased the save file before I could transfer it.

I... actually don't remember. xD Maybe it was an Onix which I encountered on my way to Lavender Town through the Rock Tunnel. Either that, or it could've been a Heracross from the Safari Zone of Pokémon Emerald. I wasn't able to catch either of them, unfortunately. I didn't have any Poké Balls with me to catch the first one, and the second one ran away from me as soon as I tripped over it.

mine was a shiny trapinch it became flygon pretty badass... too bad my sapphire versions glitched and deleted my save data when i tried to transfer it to diamond...

Hm, I had a shiny onix get away from me in Black 2 so I went to play some Emerald and I found a shiny Illumise /).- can't complain its shiny. Then later on I actually found a shiny Spheal which I used on my team later on.

My first shiny was an abra, thank god for the great ball I got in the forest and helping the guy get his documents back.

My first shiny was a cacnea on Ruby. I played the game when it came out but killed it because I knew nothing of shinies at that time. Next came a shiny trapinch on saphire but after I captured it, batteries went dead. At this time, I couldn't help but rage on my gba. And recently while playing Emerald I got a shiny tentacool.

If you say in 3rd Generation games, it's Tentacool.
I was going to Dewford Town and boom! It appeared.
I've caught it using a Poké Ball and it worked. :D
I don't use it though, I stored it into the PC as a collection.

In all the years I've owned games from the 3rd Generation, I have never encountered a shiny Pokémon at all {D:} although I have never tried RNGing either or let alone soft-resetting..

My first shiny in a third gen game was a shiny groudon. I was about to catch it when my gba died. When I finally got to it again, it wasn't shiny anymore. : (

My first shiny in any Pokémon game was a Geodude in Pokémon Diamond. Coincidentally, my second shiny was a Geodude in Emerald.

I got a Shiny Magikarp in FR and a Shiny Numel in Emerald! :D

I got a shiny Golbat at Victory road as i was training my Poke's

Mine is a Tentacool in FR

My first shiny in Ruby was a Numel, and then a Wingull in Emerald =^-^=
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Check my profile info for all my shiny encounters during my 12 yrs gaming experience with the Pokemon games

Shiny Zubat all the way. I found it in Dewford Cave.

In the third generation, all I saw was a Shiny Zigzagoon Lv2-4ish. And I saw it faint after an automatic response way-too-strong attack;-;

Wow, Shiny Zubats and Tentacools everywhere.
Mine, was a shiny Swablu. It turned into a wonderful shiny Altaria, but then...
MY SAVE FILE CORRUPTED.
Well, Pokemon Diamond was best, I got 3 shiny's without PokeRadar. 7 if you count trading.
Shiny list:
Swablu - first time (Fake Ruby)
Aron - (Sapphire - turned to Aggron later)
Zubat - (Diamond - turned to Crobat later)
Bronzor - (seriously one day after I got the Zubat)
Ratatta - (top percentage)
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Celebi - (traded event from SoulSilver)
Bagon - (my brother hatched an egg and lo, it's a shiny Bagon!)
Gyarados - (no explanation needed)
something else which I kind of forgot.