You cannot buy the Lava Cookie in Pokémon Black however you can get it as a gift by riding the Royal Unova on Mondays, Wednesdays or Fridays and beating the 4 trainers that will be on board.
you can go buy yourself a cookie and pat yourself on the back. yes cookies are fun :). Then you can tell your big brother.
First of all, you need to know what a Lava Cookie is, so you can decide if you want to get it or not. A Lava Cookie is like the Old Gateu (found in the Old Chateu in Eterna Forest): It heals all status problems. If you want to get it, fly to Pastoria City. Go over to Hotel Grand Lake. The room closest to Lake Valor should have a girl standing in front of it. When you talk to her, she should have said she lost her room key. Go over to the building where the guy heals your Pokemon. Stand 2 steps behind it. Use the Poketch app Item Finder and hit it. When you see a circle blinking over and over again, go over to it. Try to find it pressing A (This could take a while). Soon, you'll have a Suite Key! Go talk to the girl. She'll go inside. Follow her. Talk to her inside and she'll give you a Lava Cookie. If you want two, make a Pokemon hold it and make the Pokemon next to it know Thief. Put them at the front of your party. Make sure the Pokemon that knows Thief has no item. Go into a double battle. Use Thief on the Pokemon holding the Lava Cookie. They should both be holding a Lava Cookie!
buy Pokemon white
you buy it
You could buy pokemon black and white
you cannot buy them.
Yes, you can buy it with points at the Gear Station, but not with money in Pokemon.
You can buy them for P10,000 at Black City if you have enough people there.
that isnt a real pokemon game.
on EBAY
You can buy them at Black City.
In pokemon black you can buy the thunder stones from a man in the black city