Question

What legendary and non-legendary Pokemon have the highest attack stat?

Answer 1

• Highest non-legendary: Rampardos, with 165 Base Stat
• Highest legendary (excluding Arcues): Kyurem-Black, with 170 Base Stat

Answer 2

Excluding Megas:

The non-legendary Pokémon with the highest base Attack stat is Kartana at 181.

The legendary Pokémon with the highest base Attack stat (excluding Arceus, but that doesn’t change anything) is Groudon (Primal) at 180.

Including Megas:

The non-legendary Pokémon with the highest base Attack stat is Heracross (Mega) at 185

The legendary Pokémon with the highest base Attack stat is Mewtwo (Mega X) at 190

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Source: Pokédex With Stats—Pokémon Database

Hope I helped!