My team in Platinum:
;392; Flare
Close Combat, Blast Burn, Flare Blitz, Calm Mind
;026; Chi
Light Screen, Thunder, Iron Tail, Slam
;036; Usagi
Healing Wish, Meteor Mash, Moonlight, Psychic
;445; Gabby
Crunch, Dragon Claw, Draco Meteor, Dig
;407; Sakura
Petal Dance, Toxic, Synthesis, Aromatherapy
;340; Chen
Surf, Earthquake, Fissure, Future Sight
Later, I started my SoulSilver over again and added my previous SS team to my Platinum team so now I have cool rotating team of 12 Pokémon. Old SoulSilver team:
;160; Serena
Superpower, Surf, Blizzard, Crunch
;181; Clover
Thunderbolt, Light Screen, Signal Beam, Power Gem
;038; Sergei
Heat Wave, Nasty Plot, Grudge, Extrasensory
;045; Flower
Giga Drain, Moonlight, SolarBeam, Aromatherapy
;149; Drake
ExtremeSpeed, Roost, Fly, Outrage
;196; Ruby
Power Swap, Morning Sun, Psychic, Shadow Ball
+ shiny ;471; Glacier
Ice Fang, Bite, Last Resort, Mirror Coat (still work in progress)
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My team in Diamond
;389; Terra
Giga Drain, Wood Hammer, Earthquake, Crunch
;405; Flashy
Thunder Fang, Discharge, Crunch, Scary Face
;242; Valentina
Aromatherapy, Softboiled, Psychic, Shadow Ball
;224; Oscar
Surf, Waterfall, Signal Beam, Ice Beam (going to replace Waterfall with something else though)
;078; Ember
Flare Blitz, Megahorn, Bounce, Agility (going to replace Agility with something)
;448; Luca
Dragon Pulse, Aura Sphere, Dark Pulse, ExtremeSpeed
I'm going to make a rotation team with 12 Pokémon in Diamond as well, but that's still work in progress. Will include (when ready) Swampert, Metagross, Houndoom, Kingdra, Leafeon and probably Mismagius.