There's a lot to say here.
The Scoop: This was the last thing I expected to see, but I'm glad I saw it. Seeing Mega Rayquaza battle against Deoxys was really cool. Deoxys transforming was really cool to see. Also, Brendan catching Deoxys was really cool. It was the first time we saw a legendary being caught normally in an anime. Something that actually happens in-game. Also, seeing the Mawville TV and all of the pokemon working in a more natural urban enviroment gives us a nice glimpse to how regular civillians live thier lives with Pokémon. Some cool insight into this world we so admire.
Gabby and Ty were actually fun to watch. They aren't as deep as say Green, Silver or Looker (or even the Gym Leaders) but they are nice side characters to allow us into this world and to see thing in a more normal light. I want to see what this episode will lead into in the future. The cliffhanger was kinda shitty for being something we won't have a sequel to, but I liked it to make us think a little. Make us question this storyline a little.
The Old Chateau: So, we got or first look into Sinnoh. And, let me say, what a look it was. When it started, I was weirded out by how sexual and pretty Sheryl was portraited. Even ****ing Chansey was more round than normal. But after seeing the whole invisible eating scene, I actually enjoyed it. It made the scene even more unsettling and uncomfortable than it already was. It set the tone for the rest of the episode really well. Seeing the butler and the little girl being spooky and all was nice. And the chateau itself was so pretty/spooky and such a cool setting. And shout out to Haunter being creepier than Gengar in this.
But, I'm not gonna lie, I missed somethings in this. Where's Rotom? We catch him there, I wanted him to be the main mon for this episode. Even with that, I still really liked this one. The Old Chateau was really memorable for me and I liked seeing it better represented in animated form. (Don't remember how the PokéSpe mangá portraited it.) Excited to see how the last two Sinnoh episode are gonna go. I imagine Cyrus, Cynthia, Giratina and the Distortion World are gonna be in one. The other may be Barry and his Father. Or Looker again, since he's original from Sinnoh (at least from our perspective.)
One last thing: We are starting to go into the spoopy crap Pokémon does, and I'm happy for it.