Mega Ray EV help

#1
Hi people, could you help me w / EVing a Mega ray that can survive Timid Mewtwo's Ice Beam and adamant kangaskhan's Double Edge 100% of the time while retaining its max attack? This is my first post on smogon and I'd gladly appreciate any help.

Rayquaza-Mega @ Choice Band
Ability: Air Lock
Level: 50
Shiny: Yes
EVs: 4 HP / 252 Atk / 252 Spe
Naughty Nature
- Dragon Ascent
- Extreme Speed
- Earthquake
- Overheat

This is the main sweeper of my team, the choice band helps it pick up surprise OHKOs on opposing foes.
-OHKOes majority of the metagame w/ dragon ascent.
-OHKOes mega- mawile w/ overheat.
-EQ 2HKOs 252HP Groudon most of the time.
 
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#4
Very sorry, I wasn't finished w/ my post @ that time.
Okay. Just want to tell you that these kind of posts are better suited for the Simple Questions thread that we have here. You could also have figured out the spread by yourself by playing around with a damage calculator (this one has vgc 16 sets added as well). Regardless, I did the calcing myself and got this spread:

EVs: 132 HP / 252 Atk / 124 Spe

252+ Atk Parental Bond Mega Kangaskhan Double-Edge vs. 132 HP / 0 Def Mega Rayquaza: 164-196 (83.2 - 99.4%) -- guaranteed 2HKO
252 SpA Mega Mewtwo Y Ice Beam vs. 132 HP / 0- SpD Mega Rayquaza in Strong Winds: 156-184 (79.1 - 93.4%) -- guaranteed 2HKO