Welp. Once I get Eviolite and breed another Chansey, she's going to be the hardest to hit tank.
The biggest problem with that set up, actually, is Chansey/Blissey is at a real risk of being PP Stalled out depending on the Pokemon. Once I get Seismic Toss, it's not as much of an issue, but I can't PP Stall the opponent because they just miss every time and never use PP. In some fights, like Noel's Clefable, it becomes an actual problem to watch out for.