Yes Latios and Latias will have Mega Stones however they will be distributed when Omega Ruby and Sapphire come out in November.
You cannot find the Mega Stone for Latios in Pokémon X or Pokémon Y.
You get latios. Then mega stones. BOOM POW ZAM kapow.
It will helps you to catch Latios or Latias
It is an event stone that allows you to apture latios if you hav HG and latias in SS
There is no such thing as a mega stone in Pokémon Pearl. Mega stones were first introduced in Pokémon X and Y and are required for certain Pokémon to Mega Evolve, which is a temporary new evolution stage.
You cannot find Latios in Pokemon HeartGold unless you went on wi-fi and got the Enigma Stone
You can catch Latios in Pokémon HeartGold by having access to the Enigma Stone which was once available as a Wi-Fi distribution but is no longer available. You would have to take the Enigma Stone to the Museum in Pewter City and Steven Stone, the Hoenn Champion from Pokémon Ruby and Sapphire will be there and he'll take it from there and will later reveal that the Enigma Stone is actually an item that is called the Soul Dew. You will then exit the Museum and you'll come across a Latios that is ready to challenge you. Latios will be at Level 40. Additionally you can migrate a Latios from a Pokémon Gameboy Advanced game such as Ruby, Sapphire, FireRed, LeafGreen or Emerald.
Latios was available through an event which held the Enigma Stone. You could take that stone to the Pewter City museum, and when you walk outside, Latios will appear and you can battle it to capture it any time you want. This was a Wi-Fi event that ended around August 27, 2010.
Nowhere. As of now there is no such a thing as a Mega Salamence.
Engima stone event, which is pretty much over now...
You need to find Steven Stone in Kanto (I think he's in Cerulean City) and latios will run around and u have to chase it and it will be at level 35
You don't use any specific Pokemon. You must have the enigma stone. You could have gotten the stone from a long ago event, which has since passed. With the enigma stone, you take it to Steven to be evaluated in a museum for fossil resurrection. Walk outside to battle latios.