What is the minimum amount of speed required for Scarf Garchomp to outrun Mega Alakazam?

Question

Mega Alakazam: Maximum Speed of 438

What is the minimum amount of speed EVs for this set to outspeed (i.e. 439 Spe)?

Garchomp @ Choice Scarf
Jolly Nature

Answer 1

108 speed EVs
If you don't use a +speed nature, then you need 212 speed, but then you can have adamant and higher physical attack.
source

Comments

Thanks! How did you figure this out?

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I just typed EVs into the calculator and speeds came out.