I tend to go for Smogon movesets and maybe natures and, if needed, I will EV train. Only if it would result in the preferred desirable outcome.
EXAMPLE:
Jolly Gyarados named "Rouge" (I just realized, Jolly Rouge, IRONY!) with Ice Fang, Earthquake, Waterfall and Dragon Dance. Used for murdering ingame teams with ease, specially that bastard Lance.
Hasty Smeargle named "Tipsy" with Spore, Spider Web, Belly Drum and Baton Pass. Used as a support for Rouge. EV trained in speed, originally used to TRAP the Roamers.
Using these Movepool spreads I have annihilated entire teams across Johto and Kanto, Tipsy can Spore opponents Belly Drum and Baton Pass onto Rouge who then proceeds to spam Waterfalls and Earthquakes. But that's for the pleasure of beating Lances Lv. 75 Dragonite and Lv. 72 Garchomp with one Ice Fang. Tipsy needs to be fast to Spore the foe and Belly Drum/Baton Pass so Rouge can do some bloodless carnage, if she wasn't fast, she would go down in one hit.
I don't have a WEP security system. So I can't Battle online or Stuff like that. So I don't care about all that Metagame stuff, unless I need to for In game stuff.
I Contests and Pokeathlon too.