Excluding the Red Gyarados in Crystal, what game did you get your first shiny Pokémon in? ✧・ﾟ* Do you still have it?
Pokémon Ruby, a shiny Seedot. Coincidentally enough, the first shiny I found on Pokémon Ultra Sun was actually a Nuzleaf.
Silver version. It was a female Pidgey. Sadly I don't have her anymore .
The original. The latter is eventually what happened. It lasted a long time though, so I appreciated the shinies I had on it. Glad that Nintendo/Game Freak released the games digitally so I could play it again.That was kind of a nice way of completing the full circle.
The original Silver or SoulSilver? G/S/C were notorious for their batteries that kept running out and wiping out saved games.