maybe,
but definitely in more than one cheat.
source: i did it lol
action replay. Or go to cheat guru.com and ask the question
After the big battle with all the three legendaries, you cant, unless you have a cheat.
All legendaries can be used. if you where not able to enter the pkmns, then you must have used a cheat or action replay to catch the pkmn which wouldn't work!
Yes, infact every cheat engine is free. +cheat engine 5.6 is out now.
no
their is
sadly, no. legendaries cannot breed unless you use a cheat. :)
No, you need a Master Ball for all legendaries or they will just break free
No, you can't find all the legendaries in Diamond. There isn't a Pokemon game with all the legendaries in it. You can capture 8 legendaries in Diamond, f you want all the legendaries, you'll need to visit events, trade or migrate them.
All legendaries can be shiny when soft resetting.
No, you can't get all of the Legendaries in Pokémon HeartGold although you could trade all of the Legendaries in.
Naturally, legendaries don't evolve. If someone has managed to then it was using a cheat.