Let me answer this for you!!
So there are differentiating EV spreads for all the Pokemon, but let me show you some standards.
There are many types, but three basic categories: Physical, Special, Mixed.
Sweepers focus on attack power and speed.
Special Sweeper: 252 Sp. Atk/252 Spd/4 HP
Physical sweeper: 252 Atk/252 Spd/4 HP
Physically based: 252 Atk/128 Sp. Atk/128 Spd
Specially based: 252 Sp. Atk/128 Atk/128 Spd
Speed based: 128 Sp. atk/128 Atk/252 Spd
Tanks and Semi/offensive Pokemon
Three types: Physical, Special, and the odd mix.
Tanks focus on a defensive stat (or health points) and an offensive stat.
Physical Tank: 252 Atk/252 Def/4 HP (Here you can rearrange the Def and HP a bit)
(Only one I could think of)
Special Tank: 252 Sp. Atk/252 Sp. def/4 HP (Here you can rearrange the Sp. Def and HP a bit)
Mixed Tank: 252 Atk/252 Sp. Defense/4 HP (Here you can rearrange the Sp. Defense and HP, or switch Atk to Sp. Atk and Sp. Defense to Defense)
Walls, Supporters, Clerics and Stallers
Here, it's really only Physical/Special/Mixed (surprise!), as the rest are too many to think about. There's status trollers, what I call "lullabiers" (breloom & darkrai) annd many more!
252 Def/252 HP/4 atk (juggle hp and atk if you wish)
252 Sp. Def/252 HP/4 Sp. Atk (juggle Sp. atk and hp)
So, like I said, those are just the basics. There are many, many more!!! Too many to post here. But thanks for reading my "wall of text!"