Question

Is Genesect an event pokemon? is it catchable in the game? what do the differant colors of Genesect's blasters mean?

Answer 1

Yes,Genesect is an event only Pokemon,Different colours of blasters means that he is holding a different cassette,these cassettes work like plates with Arceus,though they don't change Genesect's type,Genesect has a move called Techno Buster,the type of that move depend on the cassette.
http://bulbapedia.bulbagarden.net/wiki/Genesect