Hey Arubetsu, welcome to the forums! It's nice to meet you. If you're interested in challenges then feel free to check out the Challenges section. There are a lot of interesting challenges there that you can sign up for. What challenges do you like the most? Soul Link is one of my favourites though the nuzlocke is also a classic. :D
For roleplaying, feel free to take a look at the Roleplay Theatre! Everyone there's very friendly, plus there are a lot of creative and fun roleplays there so I think you'll enjoy the section. Also, I love your avatar - Dragonite is great <3 Is Dragonite one of your favourite Pokemon? It used to be my favourite Pokemon as a child though whilst it isn't now, I still love it. I've always liked it since watching the First Movie when it delivered mail.
Bye for now! Feel free to send me a message if you want to talk or have a question. :>