Yes, you can get ones by wifi events or trading/ migrating pokemon from other games. If you have any other questions, about pokemon, if I can answer them, I will unless someone does before me. Then I will most likely improve them.
The ones in the beigining of the game.
You can find the previous bosses in the capture arena.And for some rare ones, do all the quests. (to get quest-exclusive ones)
Yes as of right now Pokemon X and Y are the newest ones.
The exact same ones that are in Pokemon Diamond. And Pokemon Platinum. And Pokemon Pearl. AND in EVERY OTHER Pokemon game.
electivire is very good so is heatran charizard staraptor im naming off the ones that can be in the battle tower.
all the ones the do in the normal game but you have to get the darkness out or something (haven't played in ages)
Pokemon evolve so that you can have a larger variety of Pokemon and to have better ones that can be more powerful.
the other ones go to the PC
No it's a DS game Use red and blue, they r the newest game boy ones
i don't think so but there is a possibility
No, there are no fake Pokemon in the game's coding so that is impossible.
yes any ds Pokemon game can but not the game boy advanced ones or anything