I will play Penalopy, the quirky Meloetta then, if you're okay with that.

And cucumber salad will certainly stain on clothes. Some MooMoo milk will also leave a nice stain, especially if it were strawberry flavoured. Mindy could spill some on Gavin, or Gavin can spill some on himself when either of them gets accidentally pushed by Missy or Sparky as they are playing.
That will give them an excuse for clothes shopping (every man's nightmare, and I imagine even more for Gavin :lol )