Mega S51-A, 2 forms

I would like to know, how to get Mega S51-A terristrial and mothership forms, and i also wanna know what are these respective forms Stats change. On the wiki there isn't any information about his mega evolutions, so how could i know if is it worth, or not?
att.

I heard that if you GI back to legan town after u beat the 7th gym u have to see either Ripley or Sheldon and they will give u the UFO which is the name of his mega stone

i would be glad, if IV could awnser this topic and tell me Mega S51-A stats ;-;

When you say IV, do you mean me or JV? xD

Anyway, right now S51-A only has one Mega Forme available, its Terrestrial Forme:

Its ability is Mega Launcher (which powers up Pulse moves such as Dark Pulse as well as its signature move, Laser Pulse) and it has high Special Attack. Its mega stone is called the "Unidentified Fallen Object". Currently the only way to get it is from the free Mega Stone that Vaeryn gives you.

The other forme, Mothership Forme, hasn't been implemented in the game yet. It has Levitate as its ability and has high Defense and Speed. Its mega stone is called the "Oopart".

IV = Involuntary Twitch xD
Thanks for the awnser <3
I would definitly take this mega if it weren't the fact that levitates makes it immune to earth, and without levitate it would be eazier to kill ;-;