Hi there Yogambit, and welcome!
As JNathan said, you should definitely head over to our Pokemon Showdown battle simulator if you want to do some serious competitive battling, all you need is the skill of teambuilding to put a team together, and then battle! We also have the Battle Center section for all competitive battling discussions so go check it out if you can!
Anyways, I'll be seeing ya around the community and if you ever need help feel free to ask Cirno or another staff member and they'd be glad to assist you!
- [supporter]Hikari10[/supporter]