yes you can but you have to beat the game first once you do it should have something so you can transfer Pokemon from older games
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Celebi isn't available in Pokemon Black and White. You have to transfer it into Pokemon Black and White or trade for one.
The only way to get Manaphy is to get it from the first Pokemon Ranger. You can only get one per cartridge, so if you got one, you cannot play through the game again to get another one. It then have to be given as a mystery gift to Pokemon Diamond, Pearl, or Platinum. After you have the Manaphy on that game, you then have to do a Poke Transfer to transfer it over to Pokemon White 2. Your Only other options are trading it with someone or cheating.
You cannot catch Shaymin in Pokemon Black or White. You'll need to trade for it from the GTS or transfer it from the Transfer Lab.
Piplup is not in black or white. You will need to transfer it from another game.
not catch but by Pokemon transfer or the Dreamworld