mew is the strongest ,he can stop attacks.mewtwo is stronger than arceus too but mew is stronger than mewtwo mew created mewtwo. arceus is not the strongest Pokemon even though he can turn into any type because mew and mewtwo can stop attacks.
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the most powerfull Pokemon is Zaurauk the 5th genaration . No arceous is
giratinna
barrett .50cal
If you want a powerfull psychic Pokemon,chose latios,if you want a powerful fire Pokemon chose sealmance.... I vote for sealmance(yay):D
There are propably a lot of different answers, but i prefer Golem. It does lack in the speed & special stats, but it has powerfull attacks along with high defense. Its a rock / ground type.