Which Pokemon has the highest Sp. Attack Stat of all Pokemon?

Question

For Legendary Pokemon and non-Legendary Pokemon.

Answer 1

Attack form Deoxys has the highest base Sp. Attack.

Mewtwo has the highest Special Attack when the alternate forms of Deoxys are not taken into account.

Alakazam has the highest Sp. Attack of all non-legendaries.

Comments

now, it is chandelure with base 145

Answer 2

Mewtwo with a base special attack of 154

Comments

With Alakazam as the highest Sp. Attack for non-legendarys.