Rate My Re-Invented Platinum Team

[Cheat_Freak]

Lv.55 Snorlax
Lv.55 Ampharos
Lv.58 Skarmory
Lv.60 Magmortar
Lv.66 Garchomp
(In process of getting a water-type for Waterfall. Temporarily using my Lv.100 Lugia. Not permanent, and not used in battle unless I have no other choice)

[Cheat_Freak]

Snorlax: Surf, Flamethrower, Giga Impact, Rock Climb
Ampharos: Thunder, Shock Wave, Signal Beam, Rock Smash
Skarmory: Night Slash, Fly, Steel Wing, Defog
Magmortar: Fire Blast, Focus Blast, Hyper Beam, Strength
Garchomp: Dragon Rush, Cut, Draco Meteor, (getting last move now)

[XpL]

Like you've said you need a Pokemon that can utilise waterfall. Apart from that you seem good to go!

[LucarioRaptor]

i would suggest that you put FLOATZEL: waterfall, aquajet, icefang, and your move of choice

[Cheat_Freak]

UPDATE ON TEAM!!!
Lv.61 Snorlax---same moves
Lv.62 Lapras---Waterfall, Sheer Cold, Thunderbolt, Hydro Pump
Lv.62 Skarmory---same moves
Lv.63 Magmortar---same moves
Lv.64 Ampharos---same moves w/ Power Gem
Lv.69 Garchomp---same moves w/ Fire Blast