I noticed the cave in seafoam island and just wanted to know if it was a just a regular cave or if it was some legendary pokemon waiting to be caught and if it is not the regi's what lies inside of this cave
The Regis are not obtainable in Pokemon HeartGold and SoulSilver. The Pokemon awaiting you in that cave is Articuno, the Legendary in the Seafoam Islands.
No, the regi's aren't in there but one of the three birds, Articuno is in there.
