Crystal was the first main series game I got that I could understand. Spent hours playing that, especially since I got get much further now that I understood it all. Before that me and my brother were given bootleg carts with Pokemon Red/Green/Blue/Yellow/Gold/Silver but we never got very far because eventually we'd get stuck and couldn't understand what to do. Even with guidebooks it was difficult, so we mostly gave up and played the N64 games.