Should I go for a timid or a modest nature mewtwo?

Question

I'm playing Pokemon let's go and since thiers no items Pokemon can hold in this game what would be the best nature for mewtwo. He can mega evolve into either x or y. Since mewtwo already has an insane sp. Atk I was thinking of using timid so he can hit first. What's your opinions?

Comments

I'm pretty sure timid is better.

Answer 1

Timid.
This is because a Timid nature allows Mewtwo to outspeed Adamant Mega Aerodactyl, Modest Mega Alakazam, Modest Electrode, +1 Dragonite, +1 Mega Charizard-X, Mega Gengar, and anything slower.
If using Mega Mewtwo Y, I still recommend Timid because it already has monstrous special attack, and outspeeding another Mega Mewtwo isn't bad either. Use Calm Mind if needed to boost special attack.
I don't play Pokemon Let's Go much, but I know this much.

Comments

Mega Mewtwo Y has the Highest Speed in the game: Timid only allows it to Speed Tie a Timid Mega Mewtwo Y, unless we could transfer them later. :P

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But mega Mewtwo X is better. Also, outspeeding another mega Mewtwo Y isn't bad. Anyway, editing my answer in reply.

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Zygarde, Marshadow, Deoxyc, Necrozma, and Naganadel don't exist in Let's Go.