How can you get the maxmium Sp att?

Question

I have no idea how to do this so can someone help.

Comments

Mega Mewtwo Y +6 holding a Sp.Attack raising item.

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Which item ....

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if i knew i would have answered

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Why did you answer in the first place btw aren't abilitys included

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Megas can't hold items beside the mega stone....

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^.
 and i didnt answer i commented.
also, mega Mewtwo Y's ability is Insomnia which prevents sleep.

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you realize im nearly 100% sure of one thing flower gift is included

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what?! Flower gift is Cherrim's signature ability and it raises Attack not Sp.Att

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A. Triple Battle
B. http://bulbapedia.bulbagarden.net/wiki/Sp._Def#Stat_modifiers  
go to special att and you will see flower gift but if you click it, it does not so I got confused

Answer 1

Mega Mewtwo Y
Modest
31 IVs Sp. Attack
252 Sp. Attack
Mega Mewtwo buffed +6 Sp. Attack
Max Sp.Attack=535x4=2140

Max Sp. Attack possible is 2,140 Sp. Attack from Mega Mewtwo Y