Is this by chance for Momo-con?

Either way, I did a Pokemon trainer where most of the outfit, sweatpants, sneakers, black t-shirt, were pulled from my wardrobe.

I bought a sleeveless jacket and a Pokemon themed hat off of Amazon to finish the look.

I did make the pokeballs, but you can also buy those.

Full disclosure, I did make a Ghastly as the focal piece of the cosplay, but I walked around without it when I wanted something casual but cosplay to wear.

Here's the completed cosplay.

I hope this helps.