So, it's showing as a shiny for the player:
But not in the replay:
http://replay.pokemonshowdown.com/randombattle-137517927
Or for me:
First picture uploaded by RMS, second by me.
This issues should be fixed as of now, due to client being synchronized.
It has been a while since Froslass got banned to BL2 yet it still shows up as RU in the teambuilder.