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Here's a list of pokemon that have stats that is most likely will not be surpass for a while.
HP: Blissey with 255
Attack: Mega Mewtwo X with 190
Defense: Shuckle with 230
Speed: Deoxys speed form with 180
Special Attack: Mega Mewtwo Y with 194
Special Defense: Shuckle with 230
Based Stats in total: 780 with Mega Mewtwo X and Y and Mega Rayquaza
Be mindful that this is before Sword and Shield release. There could be a new pokemon that could beat one of this guys out of first place.