Quite honestly it's very possible he was banned for his username since its "halalni**achad".
One of the rules is even "Do not set your "playing" status, avatar or nickname/username to anything offensive/profane"
By disappeared do you mean that it ran away or it disappeared from your account?
Either way the answer is probably no considering the fact that i've seen many posts like this and lemme just say none of their wishes came true. Also if your pokemon did disappear from your account just check your trade history and pokeebay history cause i highly doubt there is a buy even though there might be.
take a picture using ure phone and upload the picture or screen shot the problem on your phone and send it though.
Use a proxy if your school account block websites and control plus square|| takes a screenshot on a chromebook if ure using one.