[Discussion] Should mythicals be allowed in gyms?

Now I know everyone wants to have maybe just one legendary in the gym and I doubt that would happen for a while, but mythicals are extremely weak but also unique in the sense, how would you feel if mythicals are allowed? Mew and celebi are not that strong and I doubt many would have enough candies to power it up enough. With Deoxys, he will crumble by a bellsprout I'm sure. What do you think?