Not like the Sceptile would be competing against the Swellow in battle anyway...
Well, the type balance is pretty good.
You've got a Normal/Flying with great Speed, a Ghost that has good Special and pretty wide variety of attacks, a Water/Psychic that has fantastic Special and learns great moves, a Normal that could be an HM Slave, a Fire/Fighting that happens to be my favorite starter of this generation, aside from the fact it's really good with the right moveset, and a Steel/Psychic. That in itself is an awesome hybrid, and considering Metagross' high HP, it's a great Poke to have on any team.
If I were going to change it, I would suggest taking out Starmie and training something like a Manectric or (if you get your hands on one) Raichu. Personally, you've got a fair balance of types enough not to make yourself susceptible to one weakness, but having two Psychic hybrids could be a downside.
Obviously, it's up to you, but that's what I can say.
Hope this helps!
It's great to complete a Pokedex! So I'll need some help...
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