Route 201 in Diamond

This location contains the following Pokemon:

Grass or cave interior

Pokemon	Morning		Day		Evening
Bidoof	2-3	50%	2-3	50%	2-3	60%
Starly	2-3	50%	2-3	50%	2-3	40%

Swarms

Pokemon	Morning		Day		Evening
Doduo	2	40%	2	40%	2	40%
Starly	2-3	30%	2-3	30%	2-3	30%
Bidoof	2-3	30%	2-3	30%	2-3	30%

Using the Pokeradar

Pokemon	Morning		Day		Evening
Starly	2-3	44%	2-3	44%	2-3	44%
Bidoof	2-3	44%	2-3	44%	2-3	44%
Nidoran (F)	3	10%	3	10%	3	10%
Nidoran (M)	2	2%	2	2%	2	2%

FireRed in the GBA slot

Pokemon	Morning		Day		Evening
Starly	2-3	46%	2-3	46%	2-3	46%
Bidoof	2-3	46%	2-3	46%	2-3	46%
Growlithe	2	8%	2	8%	2	8%