I'm excited that the original Pokemon games are coming to the 3DS Virtual Console! Not because I think it's the "best" or anything; the original Pokemon games are janky and there's a bunch of designs in that generation that are uh, not the best. But it's the game and generation that hooked me into the franchise when I was exactly the right audience for it, so of course I'm always going to have a soft spot for them.
About the drawing itself: these guys were drawn based on what their sprites looked like in Pokemon Red/Blue (US). I took their colors from the way they look on GameBoy Color.
Pokemon (c) Nintendo and The Pokemon Company