Use seeds etc: Reviver, Azure, X-Eye. Anything to give him poor vision etc. Hunger Seeds maybe but i think he is immune to hunger seeds. Teach yourself a fighting TM. If your pokemon can learn Brick Break take advantage of it and teach it the Brick Break TM. If you dont have that TM use this wondermail code that i conveniently got from upokecenter.com :
T59X N&96 M5-J
KPS0 8PQC 1WP#
If everything i said fails just keep fighting everyone and get your level up more. BUT DONT TURN YOUR GAME OFF WHEN YOU LOSE.