Yep, Prismacolor Colored Markers. I used seven colors total: Light Cerulean Blue, True Blue, Ultramarine, Cool Grey 80%, Cool Grey 90%, Light Tan and Dark Brown. I kind of did mess up a lot. I just managed to do so on the base layer of coloring, so it was easy to cover. XD Thanks Paintedleaf, glad you like it.
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This is my wonderful competitive Pokemon team. Sprites from PokemonElite2000.com