I don't think its possible, because the 4th generation isn't advanced enough to use 5th generation Pokemon
HELLOOO, if u didn't notice i wrote "WITH CHEATS"
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no
Deoxys can only be obtained through migrating it from the Generation III Pokemon games or using the Action Replay to encounter it.
There no cheats* that can be activated in the game itself. A GameShark or ActionReplay will allow you to activate cheats. Ex: Max. PP, Max EP, Max. Stats, ect. In some of the first Pokemon games, Red and Crystal for a fact, have a glitch. In Red you can get 100 of anything, and in crystal you can duplicate Pokemon using a masterball. *(That I know of, I have looked on every cheat cite and have found nothing.)
No, not that i know of.
All Pokemon apart from the following are obtainable in Pokemon Yellow. Weedle, Kakuna, Beedrill, Ekans, Arbok, Raichu, Meowth, Persian, Koffing, Weezing, Jynx, Electabuzz & Magmar. If you want these you must trade with fellow players who are using Pokemon Red & Pokemon Blue editions, which are the previous Generation 1 games. Or from a Generation 2 game which has the desired Pokemon available.