I am thinking of a team to use in my pokemon fire red, and i decided on....
Blastoise
Pikachu
Dragonite
Exeggutor
Hitmonchan
and im think of a 6th that will have a good moveset too.
Use an Alakazam, because you can teach it powerful Sp. Atk moves.
Moves: Flamethrower, Ice Beam, Thunderbolt, Psychic
Any other Psychic or Normal type will do but Alak's the best because it has the highest Sp. Atk of all non-legendary Pokemon.
I'd go with something that's fire, since your team seems to be lacking a good fire type. I would suggest a Moltres, Ninetales, or a Arcanine. All are good fire types for you to use.