I there I have a lot of level 100 on my fire red and I want to know if..

Diamond and Pearl boast compatibility with many other Pok�mon games. They can connect with the Game Boy Advance Pok�mon RPGs after earning the National Pok�dex, when the Pok�mon Game Boy Advance cartridge is inserted into slot 2 (the Game Boy Advance cartridge and accessory slot of the Nintendo DS) while Diamond or Pearl is in slot 1 (the DS card slot). After uploading six Pok�mon, players go to an area called Pal Park and must capture them in the wild.[11] Pok�mon uploads are restricted to six per day per GBA cartridge. The player will have to re-capture such transferred Pok�mon in Pal Park by the means of a special Park Ball that has 100% chance of capture, before transferring from another GBA game. Pok�mon cannot be transferred from an English GBA game to a Japanese DS game, and the player cannot transfer any of the Pok�mon back to the GBA cartridge once they are transferred to Diamond or Pearl.

Yes, it's possible, but I think you can only do it after the E4.

Yes there is a way by using the dual slots, there is a place called pal park inthe game and when you get the national dex it mwill become availabe to you.

It isnt trading, it is transfering. The Pok�mon are caught over on Diamond or Pearl. They are still the same as what you had before, but they can never go back to the other game

It isnt called trading from past gens, it is transfering. The Pok�mon are caught in Pal Park on Diamond or Pearl. They are still the same as theywere an the other game, but they can never go back

You don't trade Pok�mon using DS to GBA. If you do DS to GBA, it's called TRANSFERING. You transfer the Pok�mon between the two games. However, if you do do DS to DS, then it's called Trading. You will swap Pok�mon, like in the past.