Beyond what was stated above, the best place for new mechanics is the mechanics research thread, which is created each generation and remains fairly up to date with various discoveries. Things like Hydro Steam mechanics and Eviolite working on Dipplin were both shared there very soon after release of each.
As a general note for people discovering this thread for the first time, before asking questions about a mechanic please search the thread to see if it's already been answered and keep in mind that testing something on showdown is not a valid source for mechanics, mechanics need to be tested on cartridge for verification.
As a general note for people discovering this thread for the first time, before asking questions about a mechanic please search the thread to see if it's already been answered and keep in mind that testing something on showdown is not a valid source for mechanics, mechanics need to be tested on cartridge for verification.