Just wondering.
In Unova, the Global Terminal can be accessed in every Pokémon Center after obtaining the first Badge.
Source: Bulbapedia/ GTS
After you get the Tri Badge in Striation City, you can use the GTS.
Yes you can you can trade any pokemon that's in your pokedex Ex if say u want a scizor in gits and if its not on your pokedex cant get him source knowledge
If your lucky you can get any pokemon in gts negotiations. Just get your first badge.