My friend suggested this Mew set and only thing I can say is it's amazing, Even with no special attack investment it gets the OHKO on TIMID Genesect. Ice beam is also a OHKO on Landorus. Transform let's you check +2 Terrakion since you will be transforming into it and they will most likely go for stone edge which it resists then you can proceed to punch holes or sweep your opponents team at +2 attack and +1 speed It can also deal with a bunch of other boosting sweepers such as Gyarados since it will most likely go for waterfall then you can kill it with stone edge a common move they use or bounce. Last slot is of your choice really, It can use Tailwind if your mew as at low health and will be KO'd next turn so that the next pokemon you switch in has double speed. Trick to mess pokemon up. Rocks for rocks.
Mew @ Choice Scarf
IV's 30 Atk, 30 Def (for hp ice)
EVs: 252 HP / 4 SAtk / 252 Spe
- Ice Beam
- TailWind/Trick/Stealth Rock