It's a Pokemon anime without Ash. WITHOUT. ASH. As we learned from Origins, that's usually a good sign that it's actually kind of good.
This time around, it follows Alan and his Charizard, who wants to battle and defeat all the Mega Evolved Pokemon for some reason (have I mentioned it just aired in Japan last night? There's only so much plot I can make out in a language I only know a few phrases of).
He seems to be one of Professor Sycamore's aides based on a flashback scene, doing research on Mega Evolution (again, for some reason this involves defeating other Mega Evolved Pokemon).
He seems to be one of those "stern and serious" anime protagonists. He also kind of gives off something of an "Emo" vibe, but without knowing what he ever says I can't say for sure.
The series also has Manon, a rookie trainer who has just gotten her first Pokemon. She joins up with Alan after seeing Charizard and Absol Mega Evolve during a battle. I'm guessing she's either just curious about it or hoping Alan will show her how to Mega Evolve Chespin (hah, sorry Manon). Alan acts as a sort of mentor to her (begrudgingly), even showing her how to catch pokemon.
Something to note of this special is it shows the Pokemon holding their Mega Stones. Unlike Origins where Red just had it in his hand. Some look good, like Charizard's armored neck-brace and Absol's necklace, and some look ridiculous like Blastoise's leather helmet. For some reason though those just disappear when they Mega Evolve.
The battles are much better animated then the ones you'll find in the normal anime, but not as well done as in Origins. They do do a wonderful job accentuating the fact that Mega Evolved Pokemon are incredibly powerful, with tons of explosions and earth shattering attacks. Sadly all 3 battles in this episode go by very quickly, instead moving on to actual plot (which is great, I just wish I could understand it).
I can't really give too much of an opinion on much else, since I didn't understand a single thing beyond "Awesome Mega Evolution battles", but I can definitely say I can't wait for this one to be subbed.
And honestly, any Pokemon anime that doesn't have Ash in it is a good thing in my book. I'm extremely happy to see them experimenting with other protagonists. Maybe if this special is as well received as Origins was, the Pokemon franchise can finally get the good anime it deserves.
For now, you can watch the raw episode online. I won't say where, just in case, but it just takes a simple google search.
One last thing. When did Wigglytuffs replace Chanseys as Nurse Joy's assistant? I do not approve. It can't even learn any healing moves (although it does learn Disable and Perish Song). Not exactly great nurse material.