Yes, it's possible. Just do it like Diamond and Pearl.
Yes.
Yes.
I think that if you beat the game, yes you can.
You trade Magmar from Pokemon pearl,diamond,or platinum to ether Pokemon pearl,diamond,or platinum.
Manaphy is obtainable in Pokemon Diamond if you also have a copy of Pokemon Ranger. The game Pokemon Ranger is able to communicate with Pokemon versions; Diamond, Pearl, Platinum, HeartGold and SoulSilver to transfer a Manaphy Egg to them. This Egg can be hatched like any other Pokemon Egg.
You get a togepi egg in Pokemon Platinum, not Diamond.
Yes they can because platinum was an extension of diamond and is in the same region, Sinnoh.
No, they removed Lavender Town in Pokemon Diamond, Pearl, and Platinum.
you can not get it from Pokemon platinum you can trade in to diamond or pearl
Pokemon HeartGold can communicate with all the DS Pokemon games. :c)
Yes but it does not involve the special features that are offered by the platinum version
Michael does not exist in pokemon diamond,pearl or platinum