In order to trade with your friends, you both need to exchange your Nintendo 3DS' Friend Codes if you want to connect via internet or be next to each other. In both cases, the console's wireless switch must always be turned on.
Search for them or trade
You should trade on the GTS for your Darkrai in Pokemon X because of Meloetta Genesect.
Pinsir is a Pokemon X exclusive pokemon if you want to obtain one you will need to trade with someone who has X.
You will need to trade for it or transfer it from the older games to the Pokemon Bank.
At the time of writing, there is no current way to trade or battle with previous generations in Pokemon X or Y. However, in December, Nintendo will be releasing a paid service called Pokemon Bank which will act as Pokemon X and Y's way of trading from previous generations (although this is only limited to Black, White, Black 2 and White 2). It does not appear that there will be any services that will allow you to battle with previous versions, however.
You may be able to find someone to trade a Special Torch for Pokemon C or Y in a Pokemon Facebook group.
It is FireRed that needs the Sapphire & Ruby Crystals :) x
Pokemon X and Y cannot trade with Diamond, Pearl and Platinum.
rejigs for mew-three X
By Transferring the Pokemon from your Unova games. That is, unless you can convince someone to trade you theirs.
The pokemon that likes Whipped Dream is Swirlix which is a Pokemon X exclusive pokemon. If you have Swirlix hold the item and then trade it to someone it will evolve to Slurpuff.
no, you can't trade Pokemon from gold to leafgreen. But you can trade them from Pokemon XD from gamecube.