What are all the Pokemon that can be caught, but require interacting with another game to be caught?

Question

Examples include dual slot Pokemon and Spiritomb in DPPt and Giratina in ORAS. Please ignore Friend Safaris in the answer and don't question my curiosity.

Comments

What are you talking about? He/she did comment.

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It was an answer at first; I guess he converted it into a comment.

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garatina palkia and dialga in Pokemon soulsilver

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Pokémon ranger manaphy?

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HGSS Dialga, Palkia, and Giratina require events, not interacting with another game. I don't think Manaphy counts because Ranger isn't a core series game.

Answer 1

I talked to a few Bulbapedia editors since I asked this question. Hopefully their combined knowledge is enough to write a complete answer.
E: Surskit
DP: Caterpie, Weedle, Ekans, Sandshrew, Vulpix, Growlithe, Gengar, Pineco, Gligar, Shuckle, Teddiursa, Elekid, Magby, Lotad, Seedot, Sableye, Mawile, Zangoose, Seviper, Lunatone, Solrock, Spiritomb, Regigigas
Pt: Caterpie, Weedle, Ekans, Sandshrew, Vulpix, Growlithe, Gengar, Pineco, Shuckle, Teddiursa, Lotad, Seedot, Sableye, Mawile, Zangoose, Seviper, Lunatone, Solrock, Spiritomb, Regigigas
HGSS: Rayquaza
BW: Landorus
B2: Regice, Regigigas
W2: Registeel, Regigigas
XY: every Friend Safari Pokemon
ORAS: Regigigas, Giratina, Landorus, Kyurem
USUM: Rayquaza, Regigigas, Giratina, Landorus, Kyurem
source