It is not known whether they are making Pokemon Black and White 3 but I personally don't think it would happen since they are about the release Pokémon X and Pokémon Y, the 6th Generation of the games.
Pokémon X and Y are the first games in the main-series to be completely in 3D and will be released globally on October 12h, 2013 (exlcluding some countries).
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You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
in Pokemon black or white use a dowsing machine near the fountain in Striaton city to the left of the entrance to route 3. I'm sorry if I make a mistake ^-^
Okay. insructions: 1) upgrade your Pokemon black/white to version 1.2.0 2) talk to Cynthia in undella town 3) Go to the gyms and battle away :)
~Here are some ways to get a Gliscor 1. Go to Poke Transfer to transfer an old Gliscor 2. Transfer a Gligar through Poke transfer 3. Go to GTS and Deposit a Pokemon to get one or Find a wild Gliscor in Pokemon black and white ===================THATS ALL I CAN HELP TY===================
The Relocator only lets you transfer Celebi and the 3 'crown' legendary beasts. But later in the game, the PokeTransfer lab lets you transfer any pokemon.