In order to have a mega evo for a Kanto starter, do I need the poke from X/Y or can I transfer one in from a previous game? I'm torn on which Kanto starter I want to use --- 3DS FC: 0817 3744 4349 http://backloggery.com/canoli220
We assume (hasnīt been directly stated, but itīs preety obvious) Mega Stones work on any variant of the correspondant species, so transfer away. --- The man who will steal your candles. Official Omoikane of the SMT IV board.
In the strictest sense of the word, I would say no. That is to say, a venasaur from anywhere could mega evolve if it has the corresponding hold item. That said, I suspect that ingame you will only receive the mega-stone that corresponds to the kanto starter you choose from the professor.
Of course, it's plenty likely that you will then be able to get other mega-stones from the battle tower/subway/whathaveyou.
The one in X/Y will be holding the necessary item. I don't know if it'll be the only way to get the items, but if you have, say, Charizardite, you can give it to any Charizard and it should, in theory, work --- White Friend Code: 1764 2206 9014 The official Shadow Lugia of the Pokemon X/Y boards