I can't wait till we have a solid guide for new chaining mechanics this gen. They've most certainly changed from 4th gen, cause I got to 40 chains dozens of times back then, and now I'm lucky if I get to 10 in Y using the same methods. The one thing I think I've got figured out is how the grass shakes seems to matter more than where it shakes. You wanna look for the patch that always shakes the same is what I'm guessing. Whereas back in 4th gen what mattered most was the patch furthest away, that seems to matter much less now, maybe not at all.