I'm looking for what the definitive site for searching rulings for Pokémon TCG cards is, similar to MTG's Gatherer. Searching for specific cards comes up with various different answers, but most are reddit threads or Pokébeach threads.
As an example, I was looking for Decidueye-GX's ability Feather Arrow, to find out whether it was allowed to be used on the first turn or not. I found out it was, but not from anything looking official - just various discussions of the standard Decidueye-GX decks.
I'd like to be confident that my practice games are consistent with what a judge will rule in a tournament.