I'm debating between playing Diamond with a Dragon theme team or a Grass one.
Dragon will look like (at Lv. 60 pre-E4):
: Heat Wave, Shadow Claw, Air Slash, Brick Break
: Surf, Waterfall, Ice Beam, Dragon Pulse
: Leaf Blade, Iron Tail, Leech Seed, Crunch
: Earthquake, Dragon Rush, Fire Fang, Stealth Rock
: Crunch, Fly, Zen Headbutt, Thunder Fang
: Roar of Time, Metal Claw, Earth Power, Heal Block
Grass (also at hypothetical Lv. 60 pre-E4):
: Crunch, Earthquake, Leech Seed, Leaf Storm
: Blizzard, Wood Hammer, Brick Break, Rock Climb
: Surf, Waterfall, Solarbeam, Fake Out
: Fly, Cut, Rock Smash, Synthesis (entry hazard instead?)
: Hypnosis, Dream Eater, Strength, Sunny Day
: Toxic, Synthesis, Sludge Bomb, Leaf Storm (Petal Dance? Solarbeam?)
As mentioned, these are designed to be theme groups (meaning they vary within the constraints of sticking to one type or breeding group) and I spent most the last evening working the theory out and starting breeding work for both groups, which will be assembled and TM'd and HM'd up in tandem on Pearl before one goes to Diamond, once I restart the game...but I'm not sure which I actually want to do...