I don't think Mega Evolution would make much difference, seeing as how Ash hasn't even been able to do it yet, despite having 4 Pokemon capable of it (And 3 others who can should they evolve).
So having Arbok and Weezing be able to perform it before any of Ash's would be kind of jarring.

So i finally made progress in ORAS. I took a page out of Matrix's book and named my new team mate Rarity.

http://i.imgur.com/tKUxjYa.gif
Snake Pokemon flirting...

Oh Flygon, will your abuse never end?!

"Does it hurt knowing I'm gonna get to Mega Evolve first~?"

I feel so sorry for Flygon, he didn't get a mega evolution due to laziness.

http://orig01.deviantart.net/9d03/f/...ot-d84ln6m.png

Poor baby needs standard form stat buffs, more moves, a Mega and Dragon Dance.

Or the world just needs to accept that Flygon was never meant to be a strong dragon type and was intended to wallow the shallow pools with Kingdra and Druddigon of "Pokemon to pad the type out."

Pokemon Confessions:
I always keep my starter on my team, even if there's a superior Pokemon of that type availablel
I never soft reset on starters for best IVs and nature (Mainly because there's like, 20 minutes of dialogue and running back and forth before you get your starter nowadays).
I don't build "Optimal" teams while adventuring, almost always just picking Pokemon based on "He looks cool/cute" during the main game.
I tend to avoid running legendaries and pseudo-lengendaries on my main team because I'm not a bitch who needs a crutch.