Jirachi

I know we probably wont be getting jirachi for a while, but just wondering. How well does jirachi stack up against metagross now? I know metagross with meteor mash eclipses it, but how close or far behind metagross will jirachi be in a best case senario, against something weak to both steel and psychic?

And by extension excluding legacy metagross, how well do jirachi and dialga compare against one another