Have ref dress up in a pokemon suit for some lulz. Having a degree of humor in the wedding can be extremely helpful in solidifying memories of it in your and others minds.
Being the only wedding with ref (who I'm guessing will be the best man) dressed up in a pokemon suit will definetly make you stand out from all the other weddings and make it all the more memorable. Its something you'll be able to tell your grandkids.
If he refuses, guilt trip him into wearing it.
But the truth is Ref dressing up in one will also be a big bonus for himself as well. All the fine ladies there will see he's the man with the big testes and guts to do something brave like that, and soon they will be lining up to get refs phone number. Its acts of courage like this that real men are made out of, not the effeminate pansy pampered men that make up todays western societies.