How can I determine the most suitable EVs for my belonged Pokemon?

I got an impish Mew by an accident (on a fan-made game) and I have learned that nature really matters for Pokemons. But how on earth can I determine the most-suitable EV spread for my Mew and other Pokemons? And my other question is for movesets: my style of moveset is a stab move, a coverage move and a status move but I do not know if it is right or what should I put in last slot

Pleaselog inorregisterto add a comment.

Because up to two stats can have max EVs, a Pokemon will usually have max EVs in the two stats it needs the most. If you have a hard time telling which two they are for your Pokemon, you can refer to this list. Find the term that best describes the Pokemon and use the corresponding EV spread.Physical sweeper: 252 Atk/252 SpeSpecial sweeper: 252 SpA/252 SpePhysical tank: 252 HP/252 AtkSpecial tank: 252 HP/252 SpAPhysically defensive: 252 HP/252 DefSpecially defensive: 252 HP/252 SpDFast support with no offensive capabilities: 252 HP/252 Spe

Your Mew happens to have a bad nature, as impish decreases special attack and Mew’s best attacks are all special. If you really wanted to use it, then I would suggest that you use special attacks anyway, with the moves will-o-wisp, roost, psychic, and ice beam. Mew appreciates being able to move first, so give it an EV spread of 252 SpA/4 SpD/252 Spe.source