well it depends if you mean from a gameboy game then you once you see all the Pokemon in sinnoh then the pal park will open you may have to beat the Pokemon league but once you do that then go to the pal park and you can migrate Pokemon from ruby Sapphire emerald fire red and leaf green
Battle Every Single Character in the Game to meet all the Pokemon in Pokemon Pearl.
First of all, beat the Pokemon League. If you have not done this, you must do it and see all 150 Pokemon in Sinnoh before this option becomes available. If it does stiil not work, it may simply be that the games are not compatible.
If you're migrating from Emerald to Diamond, Pearl, Platinum, HeartGold, or SoulSilver, then nowhere. You want to go to the title screen on the DS game and go down until you see "Migrate from Emerald". When you see that, select it and pick the six Pokemon to migrate.
YOU DON'T REALLY LOOK FOR SHINY POKEMON YOU JUST WALK AROUND IN TALL GRASS (OR ANY OTHER SPOT TO CATCH POKEMON) AND THEN OUT OF THE BLUE A SHINY POKEMON APEARS.
Migrating animals.
150 Pokemon
I think you need to see them all.
I'm not sure about catch but in the Sinoh dex you can see 150 Pokemon
You can't. You need to see that Pokemon before asking for it. You can also try the GTS Negotations and see if someone is willing to trade you the Pokemon you want/need.
150
all of them in the regional pokedex
Use your Pokemon to see how many trainers you can defeat in a row.