Fun looking character. Let's break it down:
Outfit: He's wearing a long white tank top, and knee length black shorts. All you need to do is cut/distress the edges to your liking and add some Fray Check so the fabric doesn't fray.
Backpack: You might be able to find something that works. Look through ebay or thrift stores for budget friendly items.
Shoes: These are a little trickier. If you can find black or brown, or any other color that are the correct style, you can paint them red. You may have to modify a pair by adding the ankle strap.
Hair: Arda has a new mohawk style wig called the Rufio
. It comes in the shade Apple Red. You can try adding extra wefts in either Pumpkin or Light Copper Red (Arda also sells those). Then you can style the wig into his mohawk (at least, I think he has a mohawk).
Accessories: Can't recommend anything for the Pokeballs. For the "wood" you can probably make them, or wittle real branches. I can't tell if he's carrying a weapon, or something else that is hooked to the backpack.
Hope some of these suggestions give you an idea on what to look for or how to put this cosplay together. Good luck!