You can't get deoxys (unless you have the aurora ticket) in leafgreen but if you could yes you would need all 8 badges and also you would need the national dex and you would have had to deliver the ruby and sapphire to celio.
yes, all Pokemon up to deoxys(#386) are in that.
go through victory road with all gym badges
To open the Elite Four, you have to get all the Gym badges.
If you get all eight badges then you can verse the elite four. They are really good and if you beat them you become the champion.
Yes, it will obey once you get more badges. After getting all 8 badges, all Pokemon will obey regardless of level. Do note, though, that getting certain Pokemon such as Deoxys by the use of a cheating device can cause them to disobey you even if you have all 8 badges.
First you got to catch him in Pokemon leafgreen or fire red and trade. Or you can use a gameshark. it lets you catch all the Pokemon from bulbasaur to deoxys.
I think if you have all badges, and beat the elite four he should obey you. I'm sorry, but you'll have to be an excellent Pokemon hacker if you want Deoxys and Mew to obey you.
You can find Pokemon from Generation 1 and 2 there is one Pokemon you can get from Generation 3 but only if you have been to a Nintendo event (it's Deoxys btw).
The Pokemon League is located West of Viridian City. You'll need all Badges to get through.
After getting all the badges the 8th gym will open You beat givoanniORWalk Through Walls!!!!!!!!!!
they are pass victory road to get to victory road you go to the west of viridian city then get all badges and get surf and strengenth
To get to the Pokemon League in Firered/Leafgreen. You must have all 8 gym badges, have a team that knows all HM's(you'll need them), and a strong team to get past the trainers. Best of luck. Pokemon Master Chewie.