use an experience share on route 226
you train them.
train it
i don't think you can do anything in Zelda games without action replay.
No, it is impossible without the Action Replay.
you could use action replay but if you dont have action replay train at the Pokemon league which will take about a day depending on its level when you start.
You can't get Zekrom at level 9 or under without Action Replay.
you cant but u can get a palkia level 47
Put a shiny code in your action replay and they will all be red OR get a magikarp without action replay and hatch it's eggs and hope for shiny! Level it to Gyrados.
Battle trainers or wild pokemon, if that's not fast enough for you, use action replay codes.
beat up wild pokemon, gym leaders and trainers
to "obtain" 100 lvl pokemon without action replay or any cheats, you have to do it the old fashioned way and train it by battleing other pokemon with it, otherwise there is no other way unless you trade
migrate with a level 100 ditto then go to pal park