beat all the kanto gyms and the cerulean cave opens
Go into the Ceruleun cave after beating the Elite Four twice. Make sure to bring plenty of Ultra Balls.
Lugia Ho-Oh Suicune Entei Raikou Moltres Articuno Zapdos Mewtoo Latias Kyogre
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
You can't get a Mew unless you cheat, I think. A Mewtwo you can only catch in Fire Red\Leaf Green and transfer to your Pearl.
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.