If you have the upgraded pokegear go onto the radio and tap the top right button this will play professor oak's radio show cause it tells you that there has been an outbreak of a certain Pokemon when it says Chansey is on route 13 go to route 13 and find a Chansey but if it is not on the day you listen to the radio check the day after keep doing this until it says Chansey
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you cant find it you need to catch a chansey that is holding it
Go in the safari Zone and go in the Medow part and place and put in 12 plains objects and just keep throwing pokeballs at it and eventually you will catch a chansey. Be patient and constant It took me a few days!!! you can also go to http://serebii.net/heartgoldsoulsilver/safarizone.shtml and catch more pokemon!!!
Give it a soothe bell and grow it a couple lvls
You can't catch charizard in Pokemon soul silver. You can get a charmander from professor oak.
sorry you have to trade it to Pokemon soul silver