* Politoed is not obtainable in SoulSilver: Politoed is only obtainable by evolving Poliwhirl through a trade while holding a King's Rock. Since SoulSilver doesn't have trading, you can't get Politoed in the game itself.
* Action Replay Codes Work Differently: Action Replay codes modify the game's data. They can't add new Pokemon or features that weren't originally in the game.
To get Politoed, you'd need to:
* Trade: Trade a Poliwhirl holding a King's Rock with someone who has SoulSilver.
* Use a different game: Politoed is available in other Pokemon games like Pokemon Diamond and Pearl.
Let me know if you have any other questions about Pokemon games!