From the summary, it doesn't look like Ash will catch Meguroko. While it would be good for Ash to catch many Pokémon, I just hope he doesn't catch Meguroko. I guess we will have to wait and see. Keep in mind that if Ash catches a lot of Generation V Pokémon, more than he did for the previous generations Pokémon when he traveled to those respective regions, most of them might get shafted and a lot of you will ***** around about some of them being shafted come the Isshu League.
Or worse, people will complain and moan about certain team members being weak since they never took anything down, while they will probably only get to battle twice or so and don't even consider the opponent.
I still say there's probably going to be around eight pokemon used by Ash throughout Isshu, as a maximum... and of those, the most likely candidates are:
Electric: Pikachu.
Flying: Mamepato and up.
Water: Mijumaru and up.
Fire: Pokabu and up (probably), or Baoppu.
Grass type: Anything that's not Tsutaja.
Ground(/Steel) type: Moguryuu and up.
Psychic type: Rankurusu.
I think that if Ash catches more pokemon he might catch another Ground type. I really believe that Ash will still catch Pokabu.. It's his type of pokemon, may his evolutions be unpretty to look at or not.. If he doesn't, that opens the way for a Fire monkey: Hihidaruma or Baoppu.
Of the released Ground types, I can tell that the writers are at least hinting towards Moguryuu being on Ash's team by taking a quick look at the poster. It's giving the exact same vibe as Mijumaru did in the preview when its send out in the gym.
Personally I can see a really jolly Rankurusu floating around Ash. Moreso then Gochiruzure..