Ok, I'll include Vespiquen, but it's not even that it takes 50% from stealth rock, it's just that she's way too slow, but she can come in on some choice attackers and force a switch, so yeah.
I think you could also include Butterfree, double powder is sexy, it could be a great opener as we see in some very good team like firestorm's team.
Also about
Normal Team, there's a lot of thing to do. Normal does only have one weakness (fighting) and one immunity (ghost). Normal-type pokemon tend also to be very versatile, allowing to virtually hit all other pokemon type.
The point of a normal type team is to prevent to be sweep by strong fighting moves like Close Combat, Aura Sphere and stuff.
I think the greatest members of Normal type are :
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Blissey : Special Wall, annoying bitch, but very useful
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Swellow : I find that the burn orb set is very sexy, this pokemon got a good attack and speed and is a formidable revenge-killer.
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Staraptor : Intimidate, great attack and speed and part flying-type nullifying the fighting weakness.
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PorygonZ: Special sweeper is good
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Porygon2 : Usable too, trace could be very helpful in some situation, so as Conversion (change to something like ghost type)
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Togekiss : the Haxx God who doesn't have the fighting weakness
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Smeargle : the one who could get nearly all the moves of the game. Spore, baton passing and stuff are always good.
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angaskhan : Scrappy allow mummy to hit these annoying ghost
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Snorlax : not as useful as before, but things like curselax are still good to play with
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Clefable : Magic Guard prevents the pink thing to be damaged by non-attacking move like sandstorm and burn. Still useable
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Linoone : Basically, very effective belly drummer and could sweep an entire team if used correctly
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Castform : Had the ability to changer the weather and his own type, so it could be helpful in some situations
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Ambipom : Could be a great opener, as he's able to baton pass, make a u-turn or even strikes the opponent with his good attack and speed stats.
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Ditto : Just to make fun of the opponent :p
This is basically a quick list of useful normal pokemon which could effectively be improved with other normal pokemon, but to me these seems the most helpful of the normal family.