First get the national pokedex. Go to the house right under the Pokemon center in sandgem town. a little girl will be there. She will tell u where different Pokemon are. The Pokemon she says vary. Keep going every day. Sooner or later she will tell you that there is a lot of pidgey there on a certain route, when she says it you will hardly see anything else on that route.
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You can get pidgey in pokemon diamond by going to your friends house and talk to the mom and go to rout 229 and yous a pokeradar.
I'm afraid you can't catch pidgey on emerald. You can get it on diamond pearl fire red and leaf green though! Molly.
PIDGEY EVOLVES AT LEVEL............... 18 pidgey evolves at level 18 or you can catch piggeoto ( spelled wrong) in viridian forest!
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
You can catch makuhita in the fighting area in Pokemon diamond