Battle Tower Team

[Ninve]

I'm planing to do a battle tower team that will take to me to a 100 win streak. I'll try even though I heard it's very hard.
I'm kind of new to this whole competetive stuff, so don't expect this team to be perfect. ^^
Alright here we go:

Starmie@ Leftovers
Timid nature
Natural Cure ability

Grass Knot
Ice Beam
Surf
Recover

I thought of having a BoltBeam, but since I have Electivire, I thought that Grass Knot could be more useful... Am I right? >.>
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Electivire@ Expert Belt
Adamant nature
Motor Drive ability

Thunderpunch
Ice Punch
Cross Chop
Earthquake

Can't say nothing bout this guy, I think...
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Metagross@ ?
Adamant nature
Clear Body ability

Bullet Punch
Earthquake
Meteor Mash
Zen Headbutt?

I'm not really sure with him. Can I change his moveset for a better one? If he's useless in this team, what should I replace him with?
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Any kind of help is appreciated.:)