After you beat the gym leaders from kanto region go to unlocked maps and closely look at the names it should be about half way if u have unlocked most maps not including all the ones u can buy
You can access the Battle Frontier and you can catch some legendary pokemon.
you can access your battle videos on your VS Seeker in your Key Items in your Bag
OK, in emerald, Battle Tower is a part of the Battle Frontier. You can access it by beating the elite four. Scott takes you there.
You can access Dark Crater, the place where Darkrai is, after you complete Spacial Rift, which is unlocked when you talk to Lapras on the beach after The Nightmare. (The Nightmare is one of the last segments of the whole 'Azurill-is-sick-and-only-Drowzee-can-wake-him-up-thing'.
Go to any Pokemon Center and access Bebe's/Bill's/Amanita's PC.Select a PokemonSelect ReleaseSelect Yes
It's pretty simple. After you graduate from Wigglytuff's guild you will get access to Luminous Cave, a place where you can evolve any Pokemon you've recruited. Defeat Darkrai in The Crater and you will have the option of evolving your starter and partner.
you access your wardrobe by your leaf journal
There is no access code for pixie hollow.
In Pokemon Diamond, you get Dialga before the 8th gym battle. After you beat the 7th gym, you battle at the peak of Mt. Cornet, Spear Tower, and battle, preferably catch Dialga, then you can access Sunyshore City. In pearl you battle Palkia.
You use it on the lift (1st Floor) to get access to Giovanni. This is your first battle with Giovanni.
It will grant you all access to Pixie Hollow's features.
you need to have the national dex (which you can get by simply having seen the 150 Pokemon in the pokedex that are required). without it, once you sail from snowpoint, you can only access battle tower and not the other routes