Actually, the fact that it's not correct might work better for what I had in mind for the pic. Lala's not really a part of Team Rocket just like Nyuu's not a pokemon. People just think that Nyuu looks like one, which she's not entire happy about. The way I imagined it, Lala threw together a Team Rocket outfit as part of a poorly thought out joke. Not being much for details, it makes sense she might fudge the colors.