Finished that portion of the game, where you clear out the power plant full of Grunts.
Can I access the other power plants in the region? It tells me the "door is shut tight".
Ny way to access the other power plants in the Lumiose Badlands
pokemon-x-y
Related Solutions
In Lumiose City there is a "Stone Emporium" that sells...stones.
If you go in, there's usually only a clerk that sells regular stones (Fire, Leaf, Sun, etc.). However, to the left of the clerk there is a man who does sell the Mega Evolution stones.
Note, his prices are tremendously expensive, if you haven't defeated the Elite Four yet. Defeating the Elite Four and the Champion should move the game into postgame, which drastically cuts down the prices for the stones.
Here are the stones he sells:
Main Game (before Elite Four)
- Charizardite X/Y - 1,000,000
- Venusaurite - 1,000,000
- Blastoisenite - 1,000,000
Post Game (after Elite Four)
- Charizardite X/Y - 150,000
- Venusaurite - 150,000
- Blastoisenite - 150,000
According to the Pokemon Guide, pointed out by BenBrocka, the price can get significantly lower based on how "stylish" you become:
There is no Vs. Seeker in XY, but there are a couple of places where you can rebattle trainers and get some experience, if that's what you're after:
Pre-ending of game
- Battle Chateau - On route 7 (You get new trainers every 5 minutes or so from my experience). Once you reach the highest and second highest ranks you can fight Gym Leaders and Elite Four members here as well. If you use Writs the Elite Four members may have Pokemon up to level 80. And you can use different writs to affect the level of the trainers' Pokemon and the number of trainers for a certain amount of time.
- Lumiose City - In alleyways provided you have already restored power in the city (daily)
- Inverse battle in the house found on Route 18 (daily - and you get a berry as well)
- Lumiose city Restaurants - Le Nah, Le Yeah, Le Wow and Sushi High Roller in South Boulevard, Autumnal Avenue, Hibernal Avenue and Hibernal Avenue respectively where you can have double battles, triple battles and even triple rotation battles. Also unlocked after restoring power to the city.
Post-ending of game
- Your rival - Found in Kiloude City (daily)
- Lumiose City - Looker Office (if the timing is right, you can battle Emma again)
- Elite Four (any [number of] time)
Best Answer
There is some speculation/rumor that the doors may lead to events/event pokemon that have yet to be released but for now they are just shut tight. Game Freak and Nintendo have done stuff like this through the whole history of Pokemon but then again it may just be like the truck in R/B/Y(a big red herring)