4th attack for metagross and EV

[BLUE EGG]

I´m currently training one metang, but I don´t know what EV train it (obvious that I already trained 252 in attack)
I´ll use it in battle arena but I dunno the 4th move, here is everything about it currently:

metang adamant
earthquake
meteor mash
shadow ball
?

I was thinking in rock slide, but the STAB of meteor mash is the same than super effective rock slide.

ah, I´ll make it hold choice band, so no space for agility and no explosion too, because the game always use protect/detect there.

 

[Carpetted!]

Bleh. Sludge Bomb if you don't like explosion.

 

[BLUE EGG]

it isn´t that I don´t like explosion, it´s because in battle frontier I ever saw a lot of pokemon with protect, including salamences, enteis, charizards, and breloom to name 2%.

are there another options?

 

[chaos952]

Agility.

Edit: EVs: 96 HP / 252 Atk / 72 Def / 90 Spd

 

[BLUE EGG]

ah, I´ll make it hold choice band so no space for agility

and the EV places?

 

[Fluorescent Adolescent]

and the EV places?

96 HP / 252 Atk / 72 Def / 90 Spd