Unfortunately you don't get to battle him, or any other Professors...
you have to see all of the Pokemon and then you get the national pokedex from Prof. Rowen and Prof. Oak in Prof. rowen's lab after completeing the Sinnoh pokedex.
no, if you belive in cheating (witchmost people, including me, dont belive in)you can just fill out your pokedex and then got to prof. rowen, etc, so the answer is no.
Well you Must find all Pokemon in Sinnoh. Then go to prof rowans lab in sandgem and he will give it to you o and if he doesn't then that means you didn't talk to your friend that was outside of the lab ( in sandgem where prof rowen is)he will to you to go some where and the place where he tells you to go is where the old lady will show you Pelkia or Dialga matters what game you have and ya that's it.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!^_^ =]
Yes. The pokemon you battle with your starter when you "save" Prof. Rowan is a Starly, and you can find other Starly and Shinx and Bidoof on the route above your hometown.
you have to see all the Pokemon on the sinodex then prof rowan gives it to you
for one its Prof. Rowan and they are Piplup, Turtwig and Chimchar! hope i helped.
He is in Sandgem Town, in the Pokemon Lab after you see all the Sinnoh Region Pokemon.
Some, but not all. You can transfer Pokemon from Fire Red onto Diamond, though. You have to get the National Dex in Diamond first, and that involves beating the Elite Four and then speaking to Prof. Rowan.
yes you have to obtain all 202 Pokemon in Pokemon emerald and then prof. will then let you chose either cyndiquil totodile and chickorita you then have to transfer it from pal park into your diamond
first catch all Pokemon or trade with your friends then go to littleroot go to prof birch lab then he will give you chikorita,totodile&cyndaquile if you beat him prof birch Pokemon is ssssssssssssssssssssssssssssssssssecret find it by your self
Prof rowan is only in diamond and pearl and platinum.
Prof Birch is NOT in Diamond Prof OAK is in Eterna City.