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Jolly's if you want to outspeed Mega Sceptile, Mega Gengar, M-Lopunny, Jolteon and Crobat,
Or anything really over 70 base speed at +1.
Jolly only saves you until 80 base speed at +1. So you can still technically outspeed Dragonite after a Dragon Dance, Scarf Gardevoir, Dragon Dance Altaria, Scarftran, but you'd have to already be mega