M Rayquaza is pretty monstrous but I don't know if it could be called the strongest Pokemon ever. RB Mewtwo was pretty insane. It's easy to forget just how strong it was but RB Mewtwo had 252 EVs in each stat. Calculated with today's numbers if we pretend RB Mewtwo was neutral natured with 4 HP / 252 SA / 252 Speed that means it has 136 / 140 / 121 / 154 / 186 / 130 base stats alongside what is effectively Amnesia + Nasty Plot in one move. Granted Mewtwo doesn't get an ability + item + nature but back then, neither did anything else. Did I mention R/B Mewtwo had no weaknesses? Yeah.
I would face Mega Rayquaza a hundred times before I ever faced another R/B Mewtwo.
I would face Mega Rayquaza a hundred times before I ever faced another R/B Mewtwo.
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