Good stats doesnt matter if the nature doesn't match the pokemon.

Acerage PVP-ready stats would be everything above 20 + (except one that the Pokemon does not need.

For example, you can have an Adamant (+atk, -spatk) Machamp, with everything 20+ except the SPATK, because Machamp is more of a physical attacker rather than special attacker.

SuHu is absolutely right if you are planning on going into the PvP realm. It may take you a very long time to find a viable pokemon for PvP stat wise do be mindful of that.

 

I do have a tip for people that look to other sites for setups... please be mindful when you see things that suggest you train in speed as one of your stats (especially those setups that give you a very specific number of speed EVs to train), these setups assume a 31 speed IV to be in the appropriate "speed tier" so they can outspeed certain things. In PRO it is not as easy to control IVs and having lower than a 31 speed IV can really throw off movesets designed for certain PvP roles.

 

This also extends to setups for defensive EV spreads as well if you don't have 31 in HP and 31 in Def or SD you cannot fill the role suggested by that setup because it may not survive the hit the setup was intended to have you survive.

 

Long story short, if you are using and trying to get "competitive" setups know that sometimes it requires and assumes certain things that you might not be able to fully control in PRO. And that it may take a good while to find EXACTLY what you are looking for. Happy Hunting.

Its not all about ivs though. Yes they play a big role, but right nature and ability always comes first.

As the precedent posts said, nature and ability are the first things to check. About IVs, it mostly depends on what the pokemon is and what you wanna do with it. For exemple, atk IV for a huge power azumarill is CRUCIAL as every IV point get doubled, but speed stat is less an issue compared to most sweepers as Azumarill speed tier is mostly tied by EV training. On the other hand, defensive stats on very squishies pokemon like honchcrow can sometimes be overlooked, as most of the time it wont survive any hit anyways.

 

What i want to say here is don't try to get a full team of 25+ all IV, as it may take an incredible time to farm, time you could have used to enjoy what you wanted to do in the first place, playing PvP. The higher is always the better, but believe me you can do good if you play with a good team composition that got average IV.