How do I insert cheat codes for Pokemon soul silver?

If it is a long cheat you can use Action Replay Code Manager. Or if it is short you can just type it in. But while using Code Manager you have to first find the code you want to use highlight it and then click Copy. Go to your code manager and insert your Action Replay you will then have to scroll the longest column until you find the name "Pokemon SoulSilver" (In Alphbetical Order) it is based off all the games you already have on the device. Then once you cick the game name go to the menu on the bottom right corner of the screen. Click the botton it is very small. Then you will see the name of your game click "Add New Cheat" a box will pop up and it will say name your cheat, name it and the in the box below the name your cheat place click "Paste". Then you have to go click the - botton and it will go back to normal size where it just says the name " Pokemon Soul Silver" find the name on the longest menu again and then on the smaller right corner grab the name Pokemon Soul Silver and drag it to the other Pokemon Soul Silver name on the longest menua it will say "Do you wish to overwrite this or somthing like that and click "Yes" then in the upper corner clink "Update Device" then it will say "you can now dissconnect you device"

Hope I Helped!