Yes in fact you can. To start roaming latias get the clefairy doll from the man in vermilion and step out the door and latias will roam. To get latios, you need to get the enigma stone from wifi.
to catch deoxys you have to catch latis rise it to 67 than ask the scientist at mossdepp that's next to the old man if he says u can get on next one than ha ray if he doesn't than rise latis to 77.
You can't catch Rotom in heartgold.
you cant catch him in heartgold you can only get him in soulsilver
If you saw the news on latios/latias that means you have already defeated the elite four and now you can catch the latis, you can still beat the elite four if you want but for fun catch the latis then destroy the elite four with them.
You can't catch him in HeartGold. Only in SoulSilver. In HeartGold, you catch Kyogre in Embedded Tower. If you transfer either Kyogre or Groudon to the other game, you can catch Rayquayza
You can catch Ekans in Pokémon HeartGold in the Safari Zone in the Marshlands area.
you can catch lugia in whil islands in heartgold
You can't catch Skitty in Pokémon HeartGold or Pokémon SoulSilver but you can catch it in the Hoenn Field in the PokéWalker device and then transfer it over into HeartGold or SoulSilver.poke walker .
you can only catch him in soulsilver
NO!
no
No.