Welcome to PC, Pika; glad to meet you!
Is this the first time you're watching anime? If so, you should definitely watch previous seasons, if you could, as some them were simply great. Personally, I've very much enjoyed watching through Advanced Generation series; things that they've had were interesting, including characters, plot, and so forth. Original isn't too bad, either.
When Omega Ruby and Alpha Sapphire are released, which version will you likely be getting? For me, it'd probably have to be former. When generation three of games were introduced for the first time, I bought Ruby version, so I sort of want to do the same here to help relive memories and whatnot.
Anyhow, I hope you have fun here, dear! Should you ever need anything, I'm here to help; feel free to send a message to me any time, and I'll happily respond!