Meta Battle Subway PokeBase - Pokemon Q&A  If you see a shiny
roaming legendary once, and it gets away, will it stay shiny?  6
votes  For example, you see a shiny Thundurus, but it flees.
Then you see it again later. Will it still be shiny?  asked May
14, 2011 by Kyogreruler  2 Answers  5 votes Best answer  Yes
roaming pokemon's ivs, and nature are determined on your first
encounter and so because ivs and shinieness are linked it will
stay shiny.  answered May 14, 2011 by Speed freak 2 votes  I'm
pretty sure it does. It keeps Nature and stuff from first
encounter, so shininess should stay too  answered May 14, 2011
by DarthDestiny