Alright, heres the step:
1. Open pokegear
2. Select Online Play
3. Register an account
4. Login using the account you registered
5.Select Trade
6. From there you will see, request trade,wait for request and wonder trade
7.From there either you wait for me to request trade or you request me yourself using the username you just registered
8. then select any pokemon you want to trade for the pokemon i mentioned just now, anything is fine so no worries