yes it can.
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yes you can on pokemon w b at the pokemon center there is a globe witch you can transfer pokemon to planim or other pokemon games as long as the pokemon game you are giving to is at the transfer room :D
These games can fight with each other: Pokemon stadium 1 and 2 with red, blue, yellow, gold, silver and crystal. Red, blue and yellow can battle each other and gold, silver and crystal. Ruby, sapphire and emerald can battle with each other and firered, leafgreen, Pokemon colosseum and Pokemon xd gale of darkness. Diamond, Pearl and Platinum can battle each other and Heartgold and Soulsilver. The games that can battle each other can also trade with each other as well.
No. Generation V Pokemon are only available in generation V games.
Yes you can but you can't trade from black to pearl or white to diamond because the games are not compatible with each other because the Pokemon in black and white will come up as ? in the pokedex's of the other games. But you just can't trade to pearl from black or white sorry. However you can trade between black and white using infrared connection. (the other games don't have infrared that's why the game cancels the trade between pearl and black or diamond to black).
Unfortunately, in Pokemon Black and White, you cannot interact, (trade, battle etc.), with the other versions, (Platinum, Silver, Emerald etc.). only with Black and White is where you can interact.