This is already present in Beta 1, but here's an explanation of how this object works.
The Trash Bin
In certain places in Centiq, trash bins can be found with Pokemon hiding in them.
Using Tackle, you knock over the trash bins and a wild battle is triggered.
Route 665 Recycling Center
Consider 665's Recycling Center, one such place where these trash bins can be found. Wild Pokemon that can be encountered at this spot include Caterpie, Spinarak, Metapod, and, if you're lucky, Houndour.
May this tidbit of information help you in your playthrough!