Well to be totally honest with you, winter. I didn't exactly find a spreat that will help me find a chansey with an 11 encounter slot number. I actually set my DS clock and date on the 6 days where I can RNG abuse the chansey from the grass swarm with the iv spread that I want it to have. I looked at the dates on my RNG Reporter, and it said it can be RNG abuse on 2/1-6/2010. So I set my Set my DS clock and date from 1/31/2010, let it keep going from Feb. 1 to Feb. 6, and kept doing it over and over again for 1, 2, or 3 weeks until chansey appears in the route from the Grass swarm.