Seems they've finally acknowledged Milotic's greatness and perfection~
Mm, excellent!

Is Garchomp a popular Pokemon in the community? I loved him in Gen 4 a lot, and he was on my team. I'm not sure if that's an opinion that makes me sound like a Pokemon basic bro like "Charizard is my favorite Gen 1 starter".

Because similar to Miltoic and Matrix, I think Garchomp is one of the best Pokemon designs ever. I'm not a competitive player, so I'm not sure if he is a stellar pokemon in that respect.

Too bad his Mega Evolution makes him look dopey, with the dumb eyes and changing his claws and wingarm to... whatever is on the end of his hand now.

Yes. He's considered better than Zygarde just do to his stat spread, he's incredibly powerful as a sweeper, and his popularity keeps rising as more dragons come out and prove to be barely half as useful as Garchomp.

They're changed to chainsaws, and no worries. In the competitive scene, Mega Evolving Garchomp is seen as unnecessary, as he doesn't need the stat boost, and can functions better with other items (While saving the mega evo slot for another Pokemon).

YESSSSSSS! Niantic updated stops and gyms and now there are a TON around my apartment! :D So happy!

Also realized I was dumb and could collect stuff for being a leader yesterday. Fortunately Instinct took over again today (with a freaking CP 1800 Dragonite!) so I was able to go in with my now ~500 Pidgeot. Slowly ranking up. Just wish you didn't have to beat the opponents when training to get experience because that's impossible still.

But thanks to those new gyms around, got some weaker ones to challenge. Literally watching as they're being traded around and new Pokémon put in now that they just went live haha. Going for a walk later to visit them.

I really like Zygarde's 100% form. It looks super cool and I like the idea behind it being a giant from Norse mythology. What's the reason lore wise behind why Zygarde from X and Y not being able to form change?

Reason 1: They didn't think of it at the time of the game's creation.
Reason 2: There weren't enough Zygard Cells in Kalos for it to become complete.
Reason 3: The anime made something up again and the game team were like "Oh, dang, that's pretty cool for once" and decided to integrate it into the games.

What now?

Well, the anime makes shit up all the time (Thunder armor, Ash-Greninja, etc), so maybe it was the anime that came up with Zygarde Complete.
Highly unlikely, though.

Also, he gets slower when he Mega Evolves, which people see as a detriment.

Oh, I thought you meant there were Perfect Cel-er Zygarde Complete-type things in the games added because "the anime did it."