Cianwood City in HeartGold

This location contains the following Pokemon:

Surfing

Pokemon	Morning		Day		Evening
Tentacool	10-25	90%	10-25	90%	10-25	90%
Tentacruel	15-25	10%	15-25	10%	15-25	10%

Fishing with old rod

Pokemon	Morning		Day		Evening
Magikarp	10	95%	10	95%	10	95%
Krabby	10	5%	10	5%	10	5%

Fishing with good rod

Pokemon	Morning		Day		Evening
Magikarp	20	60%	20	60%	20	60%
Krabby	20	36%	20	36%	20	36%
Staryu					20	4%
Corsola	20	4%	20	4%

Fishing with super rod

Pokemon	Morning		Day		Evening
Krabby	40	66%	40	66%	40	66%
Kingler	40	4%	40	4%	40	4%
Staryu					40	30%
Corsola	40	30%	40	30%

Using Rock Smash

Pokemon	Morning		Day		Evening
Krabby	15-24	90%	15-24	90%	15-24	90%
Shuckle	23-38	10%	23-38	10%	23-38	10%