Jinx's Top 20 ORAS Mega Evolutions

Mega Sceptile is one of the best megas even if he is week to ice now.

#12

Mega Glalie hits like a truck, thanks to Refrigerate turning Normal-type moves into Ice-type moves, and boosting their power. With this, it can deal massive damage with a Refrigerate-boosted Explosion. Find the right time to explode, and this thing can really hurt your opponent.

Mega Glaile is one of the Pokemon that needed a mega and it's quite an improvement over the regular version. It's also cool how you got to use it in the demo.

#11

Mega Sableye is a tough Pokemon to take down, since Magic Bounce stops it from getting crippled by Pokemon that rely on status moves such as Taunt and Toxic to take down other passive Pokemon. Its defenses are shot up through the roof, meaning that teams will often need certain Pokemon just to break this thing. It is such a threatening Pokemon that it got suspect tested, though it barely survived the banhammer.
Though I would rather have seen it banned so I can mow down stall teams with Taunt, Toxic, and hazard stacking once again...

Mega Sableye is a beast with the added defense. Only elect fairy types can take down the Pokemon on a lucky day.

#10

Mega Altaria is a very dangerous Pokemon, having gained the Fairy type, as it capable of fulfilling a multiple number of roles. It can set up Dragon Dance and fire off powerful Pixilate Returns, hit hard off the bat with Pixilate Hyper Voices, and even be a really bulky tank. It is mostly a jack-of-all-stats, though it is able to use all of these stats effectively. This fluffy bird is one massive upgrade from the base form.

It got a major upgrade for sure even if it's still week to ice attacks.

#9

Unlike its brethren Mega Latios, Mega Latias can distinguish itself from its base form through its added defenses. Combined with Reflect Type, and Mega Latias can even take on threats that would normally scare it off, such as Ferrothorn, Hoopa, and Heatran. Just don't use it in Ubers, as not only is Soul Dew legal there, but there are more powerful Mega Evolutions.

The added defense sure help it quite a bit and it's sad how much better it is.

#8

Just by looking at those four tough-looking steel-clad arms, it's easy to see that Mega Metagross is a hard hitter, with Tough Claws increasing the power of contact moves like Meteor Mash and Zen Headbutt. It's noticeably faster, has plenty of bulk, and can hit very hard. It was suspect tested at one point, but it barely avoided the banhammer. Don't expect to see a lot of it in Battle Spot Singles, since it's walled by Aegislash and has trouble dealing with Blaziken and Mega Mawile.

#7

Mega Lopunny turned a Pokemon from zero to hero. It now has the Fighting type so that it can fire off powerful High Jump Kicks, and not even Ghost-types are safe due to Scrappy. Its Attack is raised to competent levels, and it's extremely fast, meaning that it can do work against some of the frail offensive Pokemon that tend to be slower than it.

#6

Mega Swampert is one hulk of a Water-type, having gained significant boosts in Attack. In addition, it can really do work in the rain due to gaining Swift Swim. Although it still has that glaring 4x weakness to Grass, that can be easily fixed through having another rain abuser that can deal with Grass-types, such as Tornadus. Don't bother using Hammer Arm on it, the loss in speed is a deterrent to its sweeping potential.

#5

Mega Slowbro is one of the most physically bulky Pokemon ever, with its base Defense being 180. Combined with the fact that it learns moves like Calm Mind and Iron Defense, and it getting Shell Armor, taking down a boosted Slowbro can be a real burden. If you see Slowbro on Team Preview, make sure to keep up the offensive pressure on it, otherwise you might end up with your whole team walled by this thing.

All of those Mega's are great. I do enjoy Mega Swampert the most out of those recent ones you posted though.