I found TCG Collector to be a pretty good one if you want to track or build a collection. Has a huge amount of sets, cards, pricing, etc. Kind of like Scryfall:
If you scroll down you’ll find English set info, Japanese, Promos, etc. On the left side of the page you’ll see the whole menu under the Trading Cards section (same as the link I’ve shared basically). It’s more of a site for info, pics, etc and not as much on tracking collections, prices, or building decks on a screen.
But apart from bulbapedia.bulbagarden.net/wiki/ and serebii.net/card/ which are already mentioned above, pkmncards.com/ is a pretty good website as well that I sometimes use (primarily when I want to look over just the pictures of cards for a set or Pokémon).