What Pokémon families were added during the transition from Diamond/Pearl to Platinum?

Question

What Pokemon were added to the Sinnoh Dex in Platinum compared to Diamond/Pearl?

Comments

Do you mean what new Pokemon were added to Platinum, or what previous generation Pokemon were added to the Sinnoh Pokedex in platinum?

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I'm going to assume the latter and add it to the description.

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I'm guess that by "families", they mean evolutionary lines.

Answer 1

The Pokemon added to the Sinnoh Pokedex in Platinum are:

Rotom
The Gligar Line (Gligar and Gliscor)
The Nosepass Line (Nosepass and Probopass)
The Ralts Line (Ralts, Kirlia, Gardevoir and Gallade)
The Lickitung Line (Lickitung and Lickilicky)
The Eevee Line (Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon and Glaceon)
The Swablu Line (Swablu and Altaria)
The Togepi Line (Togepi, Togetic and Togekiss)
The Houndour Line (Houndour and Houndoom)
The Magnemite Line (Magnemite, Magneton and Magnezone)
The Tangela Line (Tangela and Tangrowth)
The Yanma Line (Yanma and Yanmega)
Tropius
The Rhyhorn Line (Rhyhorn, Rhydon and Rhyperior)
The Duskull Line (Duskull, Dusclops and Dusknoir)
The Porygon Line (Porygon, Porygon2 and Porygon-Z)
The Scyther Line (Scyther and Scizor)
The Elekid Line (Elekid, Electabuzz and Electivire)
Th Magby Line (Magby, Magmar and Magmortar)
The Swinub Line (Swinub, Piloswine and Mamoswine)
The Snorunt Line (Snorunt, Glalie and Froslass)
Absol
Giratina

Comments

It's probably worth mentioning that all of these Pokemon can be traded to DP and all but the Tropius, Tangela, Electabuzz, Magmar, and Gligar families are obtainable in DP.

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Yup, all but Tropius and the Tangela line are obtainable after defeating the Elite Four, unless you don't have access to using the GBA dual slot feature, which would result in the Magby line, the Elekid line, and the Gligar line being unobtainable as well.

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Technically you can get the national Pokedex (and catch Pokemon using outbreaks and the Poke radar) without defeating the Elite 4. It's just more difficult that way.
Also why do you call them "lines" when a bunch of them are obviously not lines?

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I think that's just common phrasing

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Wait, really? You don't have to beat the E4 and Champion to get the National Dex, and only need to see all Sinnoh Pokemon? Huh, I never knew that.
Also, evolution lines are just another form of saying evolution family.