Yes by gettung the event areceus
No
I'm not sure if you can wifi trading with Pokemon platinum because I have it already
There is no code
You cant you need to trade it or get an action replay to get Arceus.
You can't catch Rotom in heartgold.
you cant catch him in heartgold you can only get him in soulsilver
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
beat the elite 4. then go to pastoria city. go in the pokemart and you will see a guy in green. talk to him and he will give you a flute. take the flute to spear pillar. use the flute and a stairway will appear. go up and you will find areceus.
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 .