Mudkip's tail has a light blue color in the normal form. As a shiny, its tail is changed to a light yellow/gold color.
Seems to me like it is sky blue: http://pokemon.marriland.com/diamond_pearl/pokedex/Mudkip/
Male Mudkips are Rash, and female Mudkips are Lonely.
MUDKIPS
Eevees
Mudkip is a pokemon...
Yes, yes they are
The mudkips do.
mermaids tail are any colours
The underdog's tail is white.
hydro pump
Throw mudkips at it!
The color for any tail light on a vehicle is red.