Couldnt catch Registeel in the event even with a master ball

[Tejkkapadia123]

Hey guys ive already posted a thread before but since no one has replied to it i am gonna post it again.. .. Guys in the event to birth Island i had submitted helioptile and had won a ticket to birth island. I went there with a master ball but i couldnt catch a registeel with it.. i asked the map designer who was online what could i have done . His name was Aspheric.. He told me to message here...I hope you'll can just give me the rgisteel or atleast my master ball with a chance to catch it again because i dont know what was wrong !!! This is a legendary pokemon and i plead that you give me a chance again..I beg you to give me a chance again..I was so into this matter that i couldnt catch the second pokemon either hope you'll help me .

Thank you