You can't catch a Wailmer in HeartGold but you can trade with someone to get it. Or you can do what I did and migrate it from another game. But be careful, if you migrate a Pokemon from another game you can't send it back to where it came from.
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I am looking to join Wailmer to my team.But, no you can't catch it with an old rod
Yes, you can. Though it's much easier and faster to catch a Wailmer by fishing.
There is no special pokebals for cathing wailmer. But net balls works quite well since wailmer is a water pokemon.
Wailmer can be found in Mossdeep City near the palm trees. Wailmer is a water type Pokemon that later evolves into Wailord.
You can catch Lombre in Pokemon HeartGold in the Safari Zone at a waterside area once you receive the National Pokedex.