Pokémon Fact Of The Day #1
The strongest Pokémon in existence is Eternamax Eternatus, with a BST of 1125.
However, this Pokémon Can not be used with out hacking. The most powerful obtainable Pokémon in existence is mega Mewtwo X and Y, and Mega rayquaza at 780 BST
If you don’t count Megas as they are temporary forms then the most powerful obtainable non-mega pokemon is The SWSH dogogs with items, and Arceus at 720 BST
and if you don’t count legadary/mythical Pokémon then the most powerful obtainable, non mega, and non legendary/mythical Pokémon would be any sudo legendary Pokémon at 600 BST