The Pokémon Bank is the only way to transfer Pokémon from Gen V to Gen VI.
Since Pokemon must be transferred from the Poke Transporter to the Pokemon Bank before those from the bank can be brought into Pokemon X or Pokemon Y, as much as 3,000 Pokemon can be transferred through the transporter into the bank. Though the player can't transfer that many Pokemon at once.
No, sorry.
The Poke Radar is not available in Pokemon Sapphire. The Poke Radar is an item exclusive to Pokemon Diamond, Pearl, Platinum, X and Y.
The Pokémon Bank app, alongside the Poké Transporter, will be released on December 27th, 2013.
Sorry, but Reshiram can only be caught in Pokemon Black and White Version.
Yes You Can Get A Pikachu In Pokemon X and Y.
Mew is not catchable in Pokémon X or Y. You must either trade for it or transfer via Poké Transporter and Pokémon Bank from an older game.
There's no specific place to find one Red Gyarados like in Gold/Silver/Crystal/HeartGold/SoulSilver, although you can encounter one through the normal 1/8192 chance of encountering a shiny Pokemon. You can also transfer one from HeartGold/SoulSilver by transferring it to Black/White/Black 2/White 2, then transferring it from there to X and Y using Pokemon Bank and Poke Transporter.
Someone hacked the game and found Mew in the code, but it is currently not possible to get it (without hacking).
The Legendary Pokemon available in Pokemon X/Y are:Xerneas (X only)Yveltal (Y only)ArticunoZapdosMoltresMewtwoZygarde
Pokemon X and Y are sold at MSRP of $39.99 (CAD)
Transfer from the older games