it is imposible unless you cheat
Yes
but only without AR no cheats!
yes you can see him in tppc or Pokemon mystery dungeon explo of time/darkness yes you can see him in tppc or Pokemon mystery dungeon explo of time/darkness
I believe you simply have to defeat them in the dungeon, and they will sometimes offer you their services. You can't choose without them offering.
no
you clear purity forest and celebi automatically joins the team without a battle
you need Pokemon channel for gamecube and you get Jirachi as a bonus.
well first you must import your mom to emerald though wifi (mystery gift) after you have the Pokemon your mom it will allow you to lay eggs of any soft of Pokemon soo yeah you get diaglea with a ditto and a jirachi but jirachi hasto hold a pen stick
seek for wondermails with joy seeds
Gain ATON of exp.
Earthquake or earth power or use ice pokemon
well if you have Pokemon heartgold/soulsilver you can get it through mystery gift... but it is only lvl five