No.
NOT possible In emarald,sapphire,ruby.possible in leafgreen and firered
For Regice, Regirock, and Registeel transfer from Ruby/Sapphire/Emerald And get them at Pal Park, or you could use an action replay but that is cheating.Otherwise you would need the Regigigas from the event. For Regigigas, you need the other Regis and go to the temple in Snowpoint city.
Not possible.
There is no possible way to get Seedot, Nuzleaf, or Shiftry without trading from Ruby or Emerald. Instead, Sapphire has Lotad, Lombre, and Ludicolo. Sorry!
No. No, you need ruby, sapphire, or emerald and capture the regis in one of them, then you need to unlock pal park by getting the national dex to transfer them to Diamond/Pearl. im sure you know where to go from there.
Sadly you can't without cheating. You must trade it from Ruby or Emerald to your Sapphire.
trade your three regi's from ruby/sapphire/or emerald. put it in the front slot of your ds, and go to pal park which is on route 221 under sandgem town. look up pal park to find out how to get in.
no it is not possible
you can migrate him from emerald or sapphire.
Only on emerald after beating the elite4 can you get a houndour, However the only other possible way to get houndour is from Pokemon colosseum and trade it to firered then trade it to ruby or sapphire or emerald.
Without Action Replay or PKMN Sapphire you can trade with PKMN Emerald.
sorry but you can't find it in Pokemon diamond/pearl without migrating regirock from Pokemon ruby, sapphire, or emerald. But I think there is a cheat on the action replay for it, but I don't know the cheat.