I think it wasI read RSE as Ruby Sapphire Emerald... (Hoenn)
Speaking of Pokemon. http://www.youtube.com/watch?v=Mq_a_OXkhHg
Never thought I'd be afeared of Magikarp.That. Was. Epic.Speaking of Pokemon. http://www.youtube.com/watch?v=Mq_a_OXkhHg
In Generation II, shininess is determined by the individual values (IVs) of a Pokémon. If a Pokémon's Speed, Defense, and Special IVs are 10, and its Attack IV is 2, 3, 6, 7, 10, 11, 14 or 15, it will be Shiny. This determination allowed for compatibility with Generation I, as if a Shiny Pokémon is traded back, then traded forward, it would retain its shininess. Despite the bonus of backward compatibility allowing for a Shiny Pokémon to learn Generation I TMs, provided it was a Generation I Pokémon, Shiny Pokémon are only slightly above average in terms of IVs.
Pender29 from Gamefaqs/Gamespot said:When third generation came around, a new method was created. Shininess was determined by a combination of three things; your trainer ID (the five digit number on your trainer card), your secret ID (a second five digit number generated by the game that you can’t normally see, hence it being called a secret ID), and the Pokemon’s PID (personality value). Without getting too detailed, basically those three numbers are converted into binary and plugged into a mathematical formula. If the result is less than 8, the Pokemon will be shiny.
Pender29 said:Remember that third number, the Secret ID? If you can find out what yours is, you can plug it into that program to find out what frames will also give you shiny Pokemon. The trick of course is finding it, it is supposed to be a secret after all. If you are lucky enough to already have a shiny Pokemon on your game, you can plug its stats into a calculator to determine your Secret ID. You can also do this if you have a few shiny Pokemon obtained from the Pokeradar (Pokeradar shinies are generated in a slightly different manner than regular random ones, so you need a few to be accurate).
If you’re playing HeartGold or SoulSilver, this is actually quite easy, since you can use the Red Gyarados to find your Secret ID. The Red Gyarados is generated using the same method as a Pokeradar shiny, so you just catch it a few times, record its stats each time, and use the calculator to find your Secret ID.