Rate my in-game Fire Red Team?

It sounds like you have a solid team planned out. I would suggest though getting rid of Buterfree as soon as possible because if you're not going to use it then the exp from trainers will just be wasted on it. I also think if you plan to have either a Kadabra or a Mr Mime, it should definitely be Kadabra and I would also suggest evolving it if you have a friend or another game device. With the water pokemon I strongly suggest Lapras. Omaster would be alright too but definitely not Vaporeon because choosing Vaporeon over those great pokemon is just foolish. Hope I helped.