I think so. I have 4 of those on my team :)
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make your floatzel learn icebeam by TM but level it up first because her garchomp has giga impact.
honchkrow/staraptor (aaron), infernape/rapidash (aaron), leafeon/roserade/torterra (bertha), empoleon/floatzel (flint), honchkrow/spiritomb (lucian), glaceon/abomasnow (cynthia's garchomp)
no ,you can't get your team rated in pokemon diamond
Infernape- Flame Wheel/Heat Wave, Close Combat, Blast Burn, Brick BreakLuxray- Thunderbolt/Thunder Fang, Shock Wave, Crunch, Ice FangFloatzel- Rain Dance, Ice Fang/Ice Beam/Ice Punch, Crunch, Hydro PumpRoserade- Sludge Bomb, Magical Leaf, Petal Dance, Poison JabBronzong- Hypnosis, Extrasensory, Iron Head/Flash Cannon, Gyro BallGliscor- Cross Poison/Poison Jab, X-Scissor/Steel Wing, Thunder Fang/Fire Fang, Aerial Ace/DigAnd if your thinking of HMs,Infernape-Rock Climb/Strength/BothLuxray-FLash/NothingFloatzel-Surf and WaterfallRoserade-CutBronzong-Flash/Rock Climb/NothingGliscor-Fly, Defog/Nothing
luxray is way better than a roserade