>>52817586It's more of a problem with moveset and partially with ability than with the base stat total. Mew having 25 higher points in total base stats isn't what makes Mew so strong.
If Silvally had access to Close Combat, Flare Blitz, Dragon Dance, Leaf Blade, Earthquake, Drill Run, Nasty Plot, Fire Blast, Blizzard, Taunt, Yawn, Transform and Recover it would be a lot more powerful
Hell it doesn't even need all of that. Just give it Dragon dance, flare blitz and Close Combat or drill run/earthquake and Normal and Fairy type Silvally would be used by a lot of people who like DD sweepers