However, Chansey does appear in later games in the series like Pokémon Mystery Dungeon: Explorers of Sky, where you can find it in:
* The Great Cave: This is a common location to find Chansey in the post-game.
* The Wishing Well: Chansey can be found in the Wishing Well on rare occasions.
Keep in mind that these are just some of the possible locations, and you may need to explore other areas or complete certain events in order to encounter it.
If you're looking for Chansey in Red Rescue Team, you'll have to stick to trading or using cheats, as it's not available in the main game.